JP2016201964A - Power storage system and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage system and a control method therefor, capable of executing fine charge/discharge control suitable for combinations of a power storage unit's operation plan and state.SOLUTION: An EMS 60 includes: an information storage unit 76 for storing operation plan information 90 showing an operation plan for a power storage unit 56; and a control condition calculation unit 78 for calculating a control condition for the power storage unit 56. A BMU 62, on the basis of the operation plan information 90 (information set 81) received from the EMS 60 and a physical quantity acquired from a measurement unit 64, determines a charge/discharge condition for the power storage unit 56 according to the operation plan and transmits the power storage unit 56's state and charge/discharge condition (information sets 82, 83) to the EMS 60. The control condition calculation unit 78 calculates the control condition by using the operation plan information 90 and the power storage unit 56's state and charge/discharge condition.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power storage system including a power storage unit configured to be able to charge and discharge electric power, and a control method thereof.

  In recent years, efforts to reduce energy consumption have been emphasized as part of environmental measures or disaster countermeasures. From such a background, power storage systems that store power consumed in demand areas and supply power as needed are becoming widespread.

  For example, Patent Documents 1 and 2 propose a system configuration in which a single master controller integrally monitors and controls a plurality of storage battery series connected in parallel. Specifically, it is described that the management control unit controls the operation of the power converter based on a control command sent from the master controller.

JP2012-210074 (FIG. 1, [0019] to [0022]) JP 2012-210081 (FIG. 1)

  However, in the systems proposed in Patent Documents 1 and 2, for the control of each storage battery series, the master controller shares necessary information between the management control unit and the state monitoring unit, and then controls the power storage unit. The conditions could not be calculated, and it was difficult to perform fine charge / discharge control suitable for the combination of the operation plan and state of the storage battery.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a power storage system capable of performing fine charge / discharge control suitable for a combination of an operation plan and a state of a power storage unit and a control method thereof. To do.

  The “power storage system” according to the present invention includes a power storage unit configured to be able to charge and discharge power, a power converter that performs charge / discharge control of the power storage unit, and a command signal to the power converter. The power management unit that causes the power converter to perform the charge / discharge control, the measurement unit that measures the physical quantity correlated with the state of the power storage unit, and the power management unit can communicate with each other, In addition, a state diagnosis unit that diagnoses the state of the power storage unit based on the physical quantity measured by the measurement unit is provided.

  The power management unit includes an information storage unit that stores operation plan information indicating an operation plan of the power storage unit, and a control condition calculation unit that calculates a control condition of the power storage unit included in the command signal. The state diagnosis unit determines charge / discharge conditions of the power storage unit according to the operation plan based on the operation plan information received from the power management unit and the physical quantity acquired from the measurement unit, and the power storage unit And the charge / discharge conditions are transmitted to the power management means. And the said control condition calculation part calculates the said control conditions using the said operation plan information read from the said information storage part, the state of the said electrical storage part received from the said state diagnostic means, and the said charging / discharging conditions.

  Thus, since the power management means stores the operation plan information indicating the operation plan of the power storage unit and transmits the operation plan information to the state diagnosis means, the power management means and the state diagnosis means have different devices. The operation plan of the power storage unit can be automatically shared without intervention. In addition, the state diagnosis unit determines the charge / discharge conditions of the power storage unit according to the operation plan, and transmits the charge / discharge conditions to the power management unit together with the state of the power storage unit. It is possible to calculate a control condition that simultaneously considers the operation plan and state of the power storage unit. Thereby, fine charge / discharge control suitable for the combination of the operation plan and state of the power storage unit can be executed.

  In addition, the power converter is connected to a system power supply via a power facility in a power service area, and the power management unit is configured to use power usage information related to power use in the power service area, and the system power supply. An information collection unit that collects power supply information related to the supply of power, and the control condition calculation unit further uses the power usage information and the power supply information collected by the information collection unit to control the control condition. Is preferably calculated. Thereby, the optimal charge / discharge control which considered the electric power usage condition and electric power supply condition in the electric power service area together can be performed.

  Further, the information storage unit stores the operation plan information indicating an operation plan for each operation time zone, and the power management means and the state diagnosis means are the operation plan information in the operation time zone to which the current time belongs. It is preferable to operate according to the operation plan indicated by Thereby, advanced charge / discharge control according to the time series of the operation plan can be executed.

  Further, the state diagnosis means determines and transmits the charge / discharge conditions including a charge / discharge restriction condition that restricts an operating range of the power storage unit, and the control condition calculation unit is configured to satisfy the charge / discharge restriction condition. It is preferable to calculate the control conditions. By operating within the operating range reflecting the state of the power storage unit, the efficiency of the entire power storage system can be further increased.

  In addition, when the operation attribute in the operation plan is maintenance operation, the state diagnosis unit determines and transmits the charge / discharge condition further including a charge / discharge recommended condition of a control parameter related to the maintenance operation sequence of the power storage unit, It is preferable that the control condition calculation unit calculates the control condition so as to follow the charge / discharge recommended condition. By performing maintenance operation under recommended charging / discharging conditions that reflect the state of the power storage unit, the life of the power storage system can be further extended.

  The information storage unit further stores first power supply information related to power supply characteristics of the power storage unit, and the power management unit generates and transmits a command signal by further using the first power supply information read from the information storage unit. Thus, it is preferable to cause the power converter to execute the charge / discharge control. Thereby, charge / discharge control suitable for the characteristics of the power storage unit can be executed.

  The power converter that is the same as or different from the power converter can be connected to a distributed power source different from the power storage unit, and the information storage unit is a second power source information related to a power source characteristic of the distributed power source. And the power management means generates and transmits a command signal using the second power supply information read from the information storage unit, so that the same or different power converters can receive the distributed power supply. It is preferable to execute power control. As a result, it is possible to easily add a distributed power supply as an expansion power supply apparatus, and to further reduce the amount of purchased power by cooperating with the distributed power supply.

  Moreover, it is preferable that the power management unit and the state diagnosis unit are configured as an integrated device. As a result, not only the equipment cost can be reduced, but also the apparatus configuration in the power storage system can be simplified, the maintenance man-hours can be reduced, or the failure risk can be reduced.

  The “storage system control method” according to the present invention includes a power storage unit configured to be able to charge and discharge power, a power converter that performs charge / discharge control of the power storage unit, and a command signal to the power converter. The power management means that causes the power converter to execute the charge / discharge control by transmitting the power, the measurement part that measures the physical quantity correlated with the state of the power storage unit, and the power management means can communicate with each other And a method of controlling a power storage system including a state diagnosis unit that diagnoses a state of the power storage unit based on the physical quantity measured by the measurement unit.

  A storage step of storing operation plan information indicating an operation plan of the power storage unit and a calculation step of calculating a control condition of the power storage unit included in the command signal are caused to be executed by the power management means. A determination step of determining charging / discharging conditions of the power storage unit according to the operation plan based on the operation plan received from the power management means and the physical quantity acquired from the measurement unit; The state diagnosing unit is caused to execute a transmission step of transmitting the charge / discharge condition toward the power management unit. In the calculation step, the control condition is calculated using the read operation plan information, the received state of the power storage unit, and the charge / discharge condition.

  According to the power storage system and the control method thereof according to the present invention, fine charge / discharge control suitable for the combination of the operation plan and state of the power storage unit can be executed.

It is a whole lineblock diagram of a power management system incorporating a power storage system concerning this embodiment. It is an electrical block diagram of the electrical storage system shown in FIG. It is the schematic which shows an example of the operation plan information regarding the electrical storage system of FIG.1 and FIG.2. It is a sequence diagram of a power storage system whose operation attribute is “normal operation”. It is a first sequence diagram of the power storage system whose operation attribute is “maintenance operation”. It is a 2nd sequence diagram of the electrical storage system whose driving | operation attribute is a "maintenance driving | operation." It is a 3rd sequence diagram of the electrical storage system whose driving | operation attribute is a "maintenance driving | operation." It is an electrical block diagram of the electrical storage system which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a power storage system according to the present invention will be described with reference to the accompanying drawings by giving preferred embodiments in relation to the control method and the power management system.

[Entire configuration of power management system 10]
FIG. 1 is an overall configuration diagram of a power management system 10 incorporating a power storage system 16 according to this embodiment. 1 and FIG. 2 and FIG. 8 to be described later, a thick line connecting the components indicates a power line, and a thin line connecting the components indicates a communication line.

  The power management system 10 is different from the grid power supply 12 supplied from a commercial distribution network, the building 14 (power service area) to which commercial power is supplied from the grid power supply 12, the power storage system 16, and the power storage system 16. The distributed power source 18 is basically configured.

  The distributed power source 18 is a small-scale power source that is distributed in a demand area such as a building 14. The distributed power source 18 is, for example, a generator that uses renewable energy, and specifically includes a solar power generator 20 that converts sunlight into electrical energy and a wind power generator 22 that converts wind power into electrical energy. Consists of. Alternatively, the distributed power source 18 may be an electric vehicle 24 including a power storage unit, a fuel cell, a gas generator, and a geothermal generator (all not shown).

  In the building 14, a distribution board 26, general loads 28 and 30, and an important load 32 for operating in an emergency are installed. The general loads 28 and 30 are loads to which power is not supplied from the power storage system 16 when the supply of power from the system power supply 12 is stopped. The important load 32 is a load to which power is supplied from the power storage system 16 when the supply of power from the system power supply 12 is stopped. For example, the general loads 28 and 30 are a washing machine, an air conditioner, a microwave oven, normal lighting, a personal computer, and the like, and the important load 32 is a television, radio, emergency lighting, and the like.

  An electric energy acquisition unit 34 is provided between the system power supply 12 and the distribution board 26. The power amount acquisition unit 34 acquires, for example, the amount of power used / the amount of power purchased in the building 14 or the state of the system power supply 12 (specifically, whether there is a power failure / reverse power flow). In addition, a thermometer 36 capable of measuring the room temperature and the outside air temperature is installed.

  In the building 14, a narrow area network (hereinafter referred to as a LAN 38) that connects electronic devices so as to communicate with each other is constructed. The LAN 38 includes an electric energy acquisition unit 34, a thermometer 36, a power storage system 16, which will be described in detail later, a management terminal 40 used for power management, and an external wide area network (more specifically, WAN 42). A router 44 that relays communication between the two is connected. Thereby, the EMS (Energy Management System) master station 48 transmits or receives various data necessary for power management to and from the power storage system 16 via the LAN 38 and the WAN 42.

  The management terminal 40 is a computer for performing various settings related to the operation plan of the power storage system 16. The management terminal 40 includes a display device that displays visible information including the current operation status / past operation record in the power storage system 16 or the type of the added distributed power source 18.

[Electric block diagram of power storage system 16]
FIG. 2 is an electrical block diagram of power storage system 16 shown in FIG. The power storage system 16 includes a power converter (Power Conditioning System: hereinafter PCS50), an expansion power converter (hereinafter, expansion PCS52), a switch 54, and a power storage unit 56. .

  The PCS 50 is a converter that can convert bidirectionally between AC power (AC) and DC power (DC), and performs charge control or discharge control of the power storage unit 56 (hereinafter collectively referred to as “charge / discharge control”). Run. The PCS 50 is connected to the system power supply 12 via the power equipment in the building 14, more specifically, the distribution board 26 (FIG. 1).

  The expansion PCS 52 is a power converter that is additionally installed when an external power supply is added. That is, the expansion PCS 52 is configured to be detachable from the power storage system 16. In this example, the expansion PCS 52 is connected to the system power supply 12 or the like on one end side and to the distributed power supply 18 on the other end side.

  The switch 54 is a switch that turns on / off the electrical connection between the PCS 50 and the power storage unit 56. The opening / closing operation by the switch 54 is controlled by an EMS slave station (EMS 60) to be described later.

  The power storage unit 56 is a secondary battery configured to be able to charge and discharge electric power, for example, a lead storage battery or a lithium ion battery. The power storage unit 56 is a power storage module configured by connecting a single cell battery 58 or a plurality of cell batteries 58 in series. The power storage unit 56 may have other configurations, such as a sodium-sulfur battery, another type of secondary battery including a nickel metal hydride battery, a capacitor including an electric double layer type, or a combination battery combining these. There may be.

  The power storage system 16 further includes an EMS 60 as a power management unit, a BMU (Battery Management Unit) 62 as a state diagnosis unit, and a measurement unit 64 that measures a physical quantity correlated with the state of the power storage unit 56. The

  The measurement unit 64 includes an assembled battery sensor 70 that measures the voltage and current of the entire power storage module, a plurality of cell sensors 72 that individually measure the voltage and temperature of each cell battery 58, and the assembled battery sensor 70 and each cell sensor 72. And a data collector 74 for collecting measurement signals.

  The EMS 60 includes a CPU (Central Processing Unit) and a RAM (Random Access Memory), for example, and is a device that controls each component of the power storage system 16. The EMS 60 collects various information for calculating various control information of the power storage unit 56 and an information storage unit 76 that stores various information (for example, operation plan information 90 described later) related to the control operation of the power storage system 16. Unit 77 and a control condition calculation unit 78 that calculates a control condition of power storage unit 56.

  The information storage unit 76 stores information on power supply characteristics (hereinafter referred to as power supply information). Examples of the power supply information include a power storage / power generation method, a type of power storage / power generation device, a power capacity, and the like. In the information storage unit 76, not only power supply information of the power storage unit 56 but also power supply information related to various power sources (system power supply 12 and distributed power supply 18) that can be connected to the power storage system 16 is stored in advance.

  The information collecting unit 77 is, for example, the latest state of the power storage unit 56 or the distributed power source 18, power usage information (for example, power consumption) regarding the use of power in the building 14, and power supply information regarding the power supply from the system power source 12. It is possible to collect temperature information inside the building 14 or outside the building 14 (for example, the amount of electric power purchased).

  The EMS 60 can communicate with the management terminal 40, the PCS 50, and the expansion PCS 52. In addition, the EMS 60 outputs a signal that instructs the switch 54 to perform an opening / closing operation.

  The BMU 62 acquires the physical quantity measured by the measuring unit 64 from the data collector 74 and diagnoses the state of the power storage unit 56 based on the physical quantity. Specifically, the BMU 62 includes a state diagnosis unit 79 that diagnoses the state of the power storage unit 56 and a charge / discharge condition determination unit 80 that determines the charge / discharge conditions of the power storage unit 56.

  Note that the EMS 60 and the BMU 62 share information related to charge / discharge control of the power storage unit 56 by transmitting and receiving information sets having a predetermined data format in a timely manner. Specifically, the EMS 60 transmits one type of information set 81 (also referred to as “first information set”) to the BMU 62. Further, the BMU 62 transmits two types of information sets 82 (also referred to as “second information sets”) and information sets 83 (also referred to as “third information sets”) to the EMS 60.

[Operation of Power Management System 10]
The power management system 10 according to this embodiment is configured as described above. Subsequently, the operation of the power management system 10 will be described in detail with a focus on the operations of the management terminal 40 and the power storage system 16.

<Operation of Management Terminal 40>
First, a specific user (so-called administrator) performs operation setting of the power storage system 16 by operating the management terminal 40 in the building 14. The contents of the operation setting include, for example, the configuration of the power storage system 16, the presence / absence and type of the distributed power supply 18, power supply information, or information related to the operation plan / policy (hereinafter, operation plan information 90). The operation plan information 90 includes, for example, a target value of electric energy used, a planned value, and operation attributes of the power storage unit 56 (specifically, normal operation, maintenance operation, independent operation, etc.).

  FIG. 3 is a schematic diagram illustrating an example of the operation plan information 90 related to the power storage system 16 of FIGS. 1 and 2. The operation plan information 90 is information indicating an operation plan for each operation time zone, and here is table data in units of one day. This operation plan information 90 indicates the planned value and target value (for example, in units of 2 hours) of the amount of power used on April 1. The operation plan information 90 includes “normal operation: mode A” in the time zone from 0:00 to 9:00 on the same day, “normal operation: mode B” in the time zone from 9:00 to 15:00 on the same day, and 15:00 on the same day. It shows that “normal operation: mode C” in the time zone of ˜22: 00, and “normal operation: mode A” again in the time zone of 22:00 to 24:00 on the same day.

  Here, “normal operation: mode A” is an operation pattern in which the power storage unit 56 is preferentially charged. “Normal operation: Mode B” is an operation pattern in which power is supplied from the solar power generator 20 with priority. “Normal operation: mode C” is a mode in which power is supplied from the power storage unit 56 with priority. The type of mode is not limited to this, and includes, for example, higher-order operation modes such as “peak cut” that suppresses the maximum power consumption of the load and “constant rate discharge” that feeds a certain percentage of power usage from the power storage system 16. May be.

  The management terminal 40 temporarily stores the set contents as the operation plan information 90 after receiving the input or change of the settings related to the operation plan. Then, the management terminal 40 transmits the stored daily operation plan information 90 to the EMS 60 of the power storage system 16 prior to execution of the operation plan.

<Operation of power storage system 16>
Next, the operation of the power storage system 16 will be described in detail with reference mainly to the sequence diagrams of FIGS. Each sequence diagram shows a process of processing among the three PCS 50, EMS 60, and BMU 62.

  The EMS 60 refers to the operation plan information 90 read from the information storage unit 76, selects an operation plan in the operation time zone to which the current time belongs, and sequentially operates according to the operation plan. In the example of FIG. 3, since the current time is “April 1, 12:00”, the EMS 60 operates in accordance with “normal operation: mode B”.

  In this manner, the power storage system 16 performs charge / discharge control of the power storage unit 56 according to an operation plan (for example, peak cut) set in advance by the user, so that the maximum amount of power used per day in the building 14 is Can be suppressed.

<Normal operation>
First, the operation (normal system and abnormal system) of the power storage system 16 whose operation attribute is “normal operation” will be described with reference to the sequence diagram of FIG. 4. This “normal operation” is an operation mode in a state where power is supplied from the system power supply 12.

  In step S01 of FIG. 4, the EMS 60 (information storage unit 76) stores operation plan information 90 indicating an operation plan of the power storage unit 56. In step S <b> 02, the EMS 60 (information collecting unit 77) collects various information for calculating the control condition of the power storage unit 56.

  In step S <b> 11, the EMS 60 transmits a first information set to the BMU 62 to make a transmission request for the second information set. In the first information set, in addition to the above-described operation attributes, other necessary information, for example, power supply information of the power storage unit 56, power supply information of the system power supply 12, control amount of the PCS50, status information of the EMS60 and PCS50, EMS60 May be included. In this case, the information collection unit 77 reads and collects the power supply information of the power storage unit 56 and the system power supply 12 from the information storage unit 76 prior to the transmission process.

  In step S12, the BMU 62 (charge / discharge condition determination unit 80) determines the charge / discharge conditions of the power storage unit 56 according to the operation plan (here, the operation attribute) using the first information set received in step S11. . Prior to this determination, the data collector 74 outputs a time series of measurement signals input from the assembled battery sensor 70 and the plurality of cell sensors 72 to the BMU 62 side.

  Then, the state diagnosis unit 79 calculates a physical quantity (a representative value of voltage, current, and temperature) correlated with the state of the power storage unit 56 by analyzing the time series of the measurement signal, and also stores the power storage unit based on the physical quantity. 56 states are diagnosed. The representative value is, for example, a statistic including a maximum value, a minimum value, an average value, a mode value, and a median value.

  The charge / discharge condition determination unit 80 restricts the operating range of the power storage unit 56 based on the fact that the operation attribute is “normal operation” and the physical quantity from the measurement unit 64 (simply referred to as “constraint condition”). The charge / discharge conditions including are calculated and determined. The “restriction conditions” are, for example, the voltage, current, power, SOC (State Of Charge), and SOH (State Of Health) of the power storage unit 56.

  When the cell battery 58 is a lead storage battery, it is strong against overcharge, but in the overcharge state, the energy efficiency of charge / discharge tends to be low. On the other hand, when the cell battery 58 is a lithium ion battery, the cell battery 58 is weak against overcharge and overdischarge, but tends to have high energy efficiency of charge / discharge in a wide range of charge states. Therefore, the charging / discharging condition determination unit 80 determines the constraint condition suitable for the power storage unit 56 by taking into account the difference in power supply characteristics as described above.

  In step S13, the BMU 62 transmits the second information set including the constraint condition determined in step S12 and the state of the power storage unit 56 to the EMS 60. In the second information set, in addition to the above-described constraint conditions, other necessary information, for example, measurement results as an assembled battery, measurement results of each cell battery 58, history information of constraint conditions, BMU 62 and power storage unit 56 Status information and a time stamp of the BMU 62 may be included.

  In step S14, the control condition calculation unit 78 of the EMS 60 calculates the control condition of the power storage unit 56 based on the second information set received in step S13. Specifically, the control condition calculation unit 78 calculates the control condition using the operation plan information 90 read from the information storage unit 76 and the state of the power storage unit 56 and the constraint conditions received from the BMU 62.

  The control condition calculation unit 78 performs at least the power information stored in the information storage unit 76 and the power usage information, power supply information, and temperature information acquired by the information acquisition unit 77 during the calculation process. One piece of information may be used together.

  In step S <b> 15, the EMS 60 instructs the PCS 50 to control the power storage unit 56. Specifically, the EMS 60 transmits a command signal including the control condition calculated in step S14 to the PCS 50.

  In step S <b> 16, the PCS 50 executes charge / discharge control of the power storage unit 56 so as to satisfy the control condition (and consequently, the constraint condition) included in the command signal received in step S <b> 15. In step S17, the PCS 50 notifies the EMS 60 of the control state (including the DC side or AC side voltage, current, and power) by the PCS 50 in step S16 together with its own status information.

  As described above, when the operation state is “normal”, the power storage system 16 sequentially repeats steps S11 to S17 regularly or irregularly. Next, the operation of the power storage system 16 when any “abnormality” is detected on the BMU 62 side while the operation state is “normal” will be described.

  In step S21, the BMU 62 notifies the EMS 60 of an abnormal message including alarm identification information and an abnormal level. In step S22, the EMS 60 notifies the BMU 62 that the abnormal message has been received in step S21.

  In step S23, the EMS 60 calculates a control condition for the power storage unit 56 in accordance with the abnormality level acquired in step S21. For example, the EMS 60 may calculate a control amount that is smaller than that in the case where the operation state is “normal” or a control value that substantially stops the charge / discharge control as the control condition. Separately from this, the EMS 60 may stop the charge / discharge control by outputting a signal instructing the opening operation to the switch 54.

  In step S <b> 24, the EMS 60 issues a control command for the power storage unit 56 to the PCS 50. In step S25, the PCS 50 executes charge / discharge control of the power storage unit 56 based on the received command signal. In step S26, the PCS 50 notifies the EMS 60 of the control state and status information of the PCS 50 itself.

  In this way, the BMU 62 determines and transmits a constraint condition that restricts the operating range of the power storage unit 56, and the control condition calculation unit 78 of the EMS 60 calculates the control condition so as to be within this constraint condition. By operating within the operating range reflecting the state of the power storage unit 56, the efficiency of the entire power storage system 16 can be further increased.

<Maintenance operation>
Next, the operation of the power storage system 16 whose operation attribute is “maintenance operation” will be described with reference to the sequence diagrams of FIGS. “Maintenance operation” includes, for example, “recovery charging” for bringing the power storage unit 56 to a fully charged state, “capacity test” for measuring the full charge capacity of the power storage unit 56, and the like.

  In step S30 of FIG. 5, the EMS 60 (information collecting unit 77) collects various information (including the operation plan information 90) for calculating the control condition of the power storage unit 56 in accordance with the change of the driving attribute.

  In step S31, the EMS 60 notifies the BMU 62 of the transition to “maintenance operation”. In step S32, the BMU 62 sends a response notification to the EMS 60 that the migration notification has been received in step S31. Thereby, the EMS 60 and the BMU 62 share that the operation attribute of the power storage system 16 has shifted to “maintenance operation”.

  In step S33, the EMS 60 and the BMU 62 start the progress management of the phase in the “maintenance operation”. For example, in the case of “recovery charge”, a maintenance operation sequence including three phases: [1] CC (Constant-Current) charge, [2] CV (Constant-Voltage) charge, and [3] Stop is executed. At this time, the EMS 60 stores the first phase number (= 1).

  In step S <b> 34, the EMS 60 issues a control command for the power storage unit 56 to the PCS 50. Next, in step S35, the PCS 50 performs charge / discharge control of the power storage unit 56 based on the received command signal. Next, in step S36, the PCS 50 notifies the EMS 60 of the control state and status information of the PCS 50 itself.

  In step S41, the EMS 60 transmits a first information set to the BMU 62, thereby making a transmission request for the third information set. This first information set includes the phase number (= 1) in addition to the various information described in step S11 (FIG. 4).

  In step S42, the BMU 62 (charging / discharging condition determination unit 80) determines the charging / discharging conditions of the power storage unit 56 according to the operation attribute and / or phase number using the first information set received in step S41. Prior to this determination, the data collector 74 outputs a physical quantity that correlates with the state of the power storage unit 56, as in step S12 (FIG. 4).

  Based on the fact that the operation attribute is “maintenance operation” and the physical quantity from the measurement unit 64, the charge / discharge condition determination unit 80 is a recommended charge / discharge condition (simply a set of control parameters related to the maintenance operation sequence of the power storage unit 56). Charge / discharge conditions including “recommended conditions” are calculated and determined. “Recommended conditions” are, for example, a CV voltage value, a CC current value, a charging time, a discharging time, a stop time, and an on / off state of the switch 54.

  In step S43, the BMU 62 transmits the third information set including the recommended condition determined in step S42 toward the EMS 60. The third information set may include the same information as the second information set in addition to the recommended conditions described above.

  In step S44, the control condition calculation unit 78 of the EMS 60 calculates the control condition of the power storage unit 56 based on the third information set received in step S43. The control condition calculation unit 78 uses the operation plan information 90 read from the information storage unit 76 and the state and constraint conditions of the power storage unit 56 received from the BMU 62, as in step S14 of FIG. calculate. In the calculation process, at least one piece of information among power supply information, power usage information, power supply information, and temperature information may be used together.

  In step S <b> 45, the EMS 60 instructs the PCS 50 to control the power storage unit 56. Specifically, the EMS 60 transmits a command signal including the control condition calculated in step S44 to the PCS 50.

  In step S46, the PCS 50 performs charge / discharge control of the power storage unit 56 so as to satisfy the control conditions (and consequently, the constraint conditions and the recommended conditions) included in the command signal received in step S45. In step S47, the PCS 50 notifies the EMS 60 of the control state by the PCS 50 in step S46 together with its own status information. As described above, the power storage system 16 executes the first phase of the maintenance operation sequence by sequentially repeating steps S41 to S47 periodically or irregularly.

  In step S51 of FIG. 6, the EMS 60 determines whether it is possible to shift to the next phase. If it is determined that migration is possible, the process proceeds to the next step (S52).

  In step S52, the EMS 60 transmits a first information set to the BMU 62, thereby making a transmission request for the third information set. Here, it should be noted that the phase number included in the first information set is a value before update (= 1).

  In step S53, the charge / discharge condition determining unit 80 of the BMU 62 determines a recommended condition according to the operation attribute and / or the phase number. In step S54, the BMU 62 transmits the third information set including the recommended condition to the EMS 60. Thereby, EMS60 acquires the recommended conditions of the electrical storage part 56 before a phase transfer.

  In step S55, the EMS 60 transmits a first information set to the BMU 62, thereby making a transmission request for the third information set. Note that the phase number included in the first information set is the updated value (= 2).

  In step S56, the charge / discharge condition determining unit 80 of the BMU 62 determines a recommended condition according to the operation attribute and / or the phase number. In step S57, the BMU 62 transmits the third information set including the recommended conditions to the EMS 60. Thereby, EMS60 acquires the recommended conditions of the electrical storage part 56 after a phase transfer.

  In step S58, the control condition calculation unit 78 of the EMS 60 calculates the control condition of the power storage unit 56 based on the received third information set. In step S59, the EMS 60 transmits a command signal including the calculated control condition to the PCS 50. In step S60, the PCS 50 performs charge / discharge control of the power storage unit 56 so as to satisfy the control condition included in the received command signal. In step S61, the PCS 50 notifies the EMS 60 of the control state and status information of the PCS 50 itself.

  As described above, the power storage system 16 executes the second phase of the maintenance operation sequence by sequentially repeating steps S55 to S61 periodically or irregularly. By the way, the BMU 62 can shift to the next phase when a specific transition condition is satisfied.

  In step S71 of FIG. 7, the BMU 62 determines whether or not it is possible to shift to the next phase. If it is determined that migration is possible, the process proceeds to the next step (S72).

  In step S72, the BMU 62 makes a phase shift request to the EMS 60. In step S73, the EMS 60 notifies the BMU 62 that the phase shift request has been received in step S72.

  Hereinafter, in steps S74 to S80, the power storage system 16 executes the third phase of the maintenance operation sequence in the same manner as in steps S55 to S61 of FIG.

  In step S90, the EMS 60 and the BMU 62 end the progress management of the phase in the “maintenance operation” on condition that the maintenance operation sequence currently being executed is completed. In step S91, the EMS 60 ends the “maintenance operation” and operates according to the next selected operation plan.

  As described above, when the operation attribute is “maintenance operation”, the BMU 62 determines and transmits the charge / discharge condition further including the recommended condition of the control parameter related to the maintenance operation sequence of the power storage unit 56, and the control condition calculation unit of the EMS 60 In 78, the control condition is calculated so as to follow the recommended condition. By performing the maintenance operation under the recommended conditions reflecting the state of the power storage unit 56, the life of the power storage system 16 can be further extended.

<Expandability of power storage system 16>
By the way, the power storage system 16 is configured such that a distributed power source 18 different from the power storage unit 56 can be added. Hereinafter, the operation of the power storage system 16 before and after the expansion will be described.

  Returning to FIG. 2, it is assumed that the expansion PCS 52 is not installed in the power storage system 16 before the expansion. In this case, the EMS 60 reads the power supply information of the power storage unit 56 (hereinafter referred to as first power supply information) from the information storage unit 76, and then generates and transmits a command signal by further using the first power supply information. Causes charge / discharge control to be executed. Thereby, charge / discharge control suitable for the characteristics of power storage unit 56 can be executed.

  On the other hand, an expansion PCS 52 is additionally installed in the storage system 16 after expansion. At this time, the EMS 60 recognizes the presence / absence and type of connection with the distributed power supply 18 by communicating with the expansion PCS 52. Then, the EMS 60 reads the power source information of the distributed power source 18 (hereinafter referred to as second power source information) from the information storage unit 76, and then uses the method described above in the same manner as in the case of the power storage unit 56. Determine the control conditions.

  In other words, the EMS 60 transmits the command signal generated using the second power supply information to the expansion PCS 52, so that the distributed power supply 18 can be used together with or separately from the charge / discharge control of the power storage unit 56. Power control is executed. This makes it possible to easily add the distributed power source 18 as an expansion power supply without affecting other components (PCS 50, EMS 60 and BMU 62), and to purchase it by cooperating with the distributed power source 18. The amount of electric power can be further suppressed.

  Further, by adding the distributed power source 18, the power storage system 16 can be operated with the power supply amount from the power storage unit 56 suppressed as much as possible. That is, there is an advantage that the power loss due to the charging operation of the power storage unit 56 can be reduced by relatively increasing the power supply amount from the distributed power source 18 and relatively reducing the power supply amount from the power storage unit 56. In addition to this, since the accumulated discharge amount by the power storage unit 56 can be suppressed, there is an advantage that the deterioration of the power storage unit 56 is difficult to proceed.

[Effects of power storage system 16]
As described above, the power storage system 16 includes [1] the power storage unit 56 configured to be able to charge and discharge power, [2] the PCS 50 that performs charge / discharge control of the power storage unit 56, and [3] the PCS 50. EMS 60 that causes the PCS 50 to execute charge / discharge control by transmitting a command signal, [4] a measurement unit 64 that measures a physical quantity correlated with the state of the power storage unit 56, and [5] EMS 60 can communicate with each other. And a BMU 62 for diagnosing the state of the power storage unit 56 based on the physical quantity measured by the measurement unit 64.

  The EMS 60 includes an information storage unit 76 that stores operation plan information 90 indicating an operation plan of the power storage unit 56, and a control condition calculation unit 78 that calculates a control condition of the power storage unit 56 included in the command signal. The BMU 62 determines the charge / discharge conditions of the power storage unit 56 according to the operation plan based on the operation plan information 90 received from the EMS 60 and the physical quantity acquired from the measurement unit 64, and the state and charge / discharge conditions of the power storage unit 56 are determined by the EMS 60. Send to. Then, the control condition calculation unit 78 calculates the control condition using the operation plan information 90 read from the information storage unit 76 and the state of the power storage unit 56 and the charge / discharge conditions received from the BMU 62.

  According to the sequence diagrams of FIGS. 4 to 7, the EMS 60 stores the operation plan information 90 indicating the operation plan of the power storage unit 56 (S01). The BMU 62 determines the charging / discharging conditions of the power storage unit 56 according to the operation plan based on the operation plan information 90 (information set 81) received from the EMS 60 and the physical quantity acquired from the measurement unit 64 (S12, S42, S53, S56, S75), the state of the power storage unit 56 and the charge / discharge conditions (information sets 82, 83) are transmitted to the EMS 60 (S13, S43, S54, S57, S76). And EMS60 calculates a control condition using the operation plan information 90, the state of the electrical storage part 56, and charging / discharging conditions (S14, S23, S44, S58, S77).

  Thus, since EMS60 memorize | stores the operation plan information 90 which shows the operation plan of the electrical storage part 56, and transmits this operation plan information 90 to BMU62, EMS60 and BMU62 are stored without interposing another apparatus. The operation plan of the unit 56 can be automatically shared. In addition, the BMU 62 determines the charging / discharging conditions of the power storage unit 56 according to the operation plan, and transmits the charging / discharging conditions together with the state of the power storage unit 56 to the EMS 60. It is possible to calculate the control conditions considering the operation plan and the state at the same time. Thereby, fine charge / discharge control suitable for the combination of the operation plan and state of power storage unit 56 can be executed.

  The EMS 60 includes an information collection unit 77 that collects power usage information related to the use of power in the building 16 and power supply information related to the supply of power from the system power supply 12, and the control condition calculation unit 78 collects The control condition of the power storage unit 56 may be calculated using the power use information and the power supply information that have been provided. Thereby, the optimal charging / discharging control which considered together the electric power usage condition in the building 14 and an electric power supply condition can be performed.

  The information storage unit 76 stores operation plan information 90 indicating an operation plan for each operation time zone, and the EMS 60 and the BMU 62 operate according to the operation plan indicated by the operation plan information 90 in the operation time zone to which the current time belongs ( May cooperate). Thereby, advanced charge / discharge control according to the time series of the operation plan can be executed.

[Modification]
Next, a power storage system 100 according to a modification will be described with reference to FIG. In addition, about the component similar to this embodiment, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 8, the power storage system 100 differs from the present embodiment (FIG. 2) in that an integrated EMS 102 is provided instead of the EMS 60 and the BMU 62. The integrated EMS 102 includes a CPU and a RAM, and can implement the EMS function 104 and the BMU function 106 by reading and executing stored programs.

  The EMS function 104 and the BMU function 106 are composed of software modules, and can perform operations equivalent to those of the present embodiment by performing internal communication between them. Thus, by configuring the power management unit and the state diagnosis unit as an integrated device (integrated EMS102), not only the equipment cost is reduced, but also the device configuration in the power storage system 100 is simplified, the maintenance man-hours are reduced, Alternatively, the risk of failure is reduced.

[Remarks]
Note that the present invention is not limited to the above-described embodiments and modifications, and can of course be freely changed without departing from the gist of the present invention.

  In the present embodiment, the EMS 60 transmits only “driving attributes” of the driving plan information 90 to the BMU 62, but some other information or all information may be transmitted and shared. .

  In the present embodiment, the distributed power source 18 can be connected to the expansion PCS 52 different from the PCS 50, but may be connected to the same power converter (that is, the PCS 50). In the case of this connection form, the EMS 60 performs power control of the distributed power supply 18 by transmitting a control signal to the PCS 50.

  In the present embodiment, one power storage system 16 is disposed in the power management system 10, but two or more power storage systems 16 may be disposed in parallel. In this case, if two or more EMSs 60 can communicate with each other, fine charge / discharge control suitable for a combination of two or more power storage units 56 can be executed, and power management optimized for the entire system is possible. become.

DESCRIPTION OF SYMBOLS 10 ... Power management system 12 ... Grid power supply 14 ... Building (power service area) 16, 100 ... Power storage system 18 ... Distributed power supply 28, 30 ... General load 32 ... Important load 34 ... Electric energy acquisition part 36 ... Thermometer 40 ... Management terminal 50 PCS (power converter) 52 PCS for expansion
54 ... Switch 56 ... Power storage unit 58 ... Cell battery 60 ... EMS (Power management means)
62 ... BMU (state diagnosis means) 64 ... measurement unit 70 ... assembled battery sensor 72 ... cell sensor 74 ... data collector 76 ... information storage part 77 ... information collection part 78 ... control condition calculation part 79 ... state diagnosis part 80 ... charge / discharge Condition determining units 81 to 83 ... information set 90 ... operation plan information 102 ... integrated EMS 104 ... EMS function unit (power management means)
106 ... BMU function unit (status diagnosis means)

Claims (9)

A power storage unit configured to charge and discharge power;
A power converter that performs charge / discharge control of the power storage unit;
Power management means for causing the power converter to execute the charge / discharge control by transmitting a command signal to the power converter;
A measurement unit for measuring a physical quantity correlated with the state of the power storage unit;
A state diagnosing unit capable of communicating with the power management unit and diagnosing the state of the power storage unit based on the physical quantity measured by the measurement unit;
The power management means includes
An information storage unit for storing operation plan information indicating an operation plan of the power storage unit;
A control condition calculation unit that calculates a control condition of the power storage unit included in the command signal,
The state diagnosis unit determines charge / discharge conditions of the power storage unit according to the operation plan based on the operation plan information received from the power management unit and the physical quantity acquired from the measurement unit, and the power storage unit The state and the charge / discharge conditions are transmitted to the power management means,
The control condition calculation unit calculates the control condition using the operation plan information read from the information storage unit, and the state of the power storage unit and the charge / discharge condition received from the state diagnosis unit. A power storage system. The power converter is connected to a system power supply through power equipment in a power service area,
The power management means further includes an information collection unit that collects power usage information related to power usage in the power service area and power supply information related to power supply from the grid power supply,
The power storage system according to claim 1, wherein the control condition calculation unit further calculates the control condition by further using the power usage information and the power supply information collected by the information collection unit. The information storage unit stores the operation plan information indicating an operation plan for each operation time zone,
The power storage system according to claim 1 or 2, wherein the power management unit and the state diagnosis unit operate according to the operation plan indicated by the operation plan information in the operation time zone to which a current time belongs. The state diagnosis means determines and transmits the charge / discharge conditions including a charge / discharge restriction condition that restricts an operating range of the power storage unit,
The power storage system according to any one of claims 1 to 3, wherein the control condition calculation unit calculates the control condition so as to be within the charge / discharge restriction condition. When the operation attribute in the operation plan is a maintenance operation, the state diagnosis means determines and transmits the charge / discharge condition further including a recommended charge / discharge condition of a control parameter related to a maintenance operation sequence of the power storage unit,
The power storage system according to claim 4, wherein the control condition calculation unit calculates the control condition so as to follow the charge / discharge recommended condition. The information storage unit further stores first power supply information related to power supply characteristics of the power storage unit,
The power management means causes the power converter to execute the charge / discharge control by generating and transmitting a command signal by further using the first power supply information read from the information storage unit. Item 6. The power storage system according to any one of Items 1 to 5. The same or different power converter as the power converter can be connected to a distributed power source different from the power storage unit,
The information storage unit further stores second power supply information related to power supply characteristics of the distributed power supply,
The power management unit causes the same or different power converter to execute power control of the distributed power source by generating and transmitting a command signal using the second power source information read from the information storage unit. The power storage system according to claim 6.   The power storage system according to claim 1, wherein the power management unit and the state diagnosis unit are configured as an integrated device. A power storage unit configured to charge and discharge power;
A power converter that performs charge / discharge control of the power storage unit;
Power management means for causing the power converter to execute the charge / discharge control by transmitting a command signal to the power converter;
A measurement unit for measuring a physical quantity correlated with the state of the power storage unit;
And a state diagnosis unit that diagnoses the state of the power storage unit based on the physical quantity measured by the measurement unit and that can communicate with the power management unit. And
A storage step of storing operation plan information indicating an operation plan of the power storage unit;
Causing the power management means to execute a calculation step of calculating a control condition of the power storage unit included in the command signal,
A determination step of determining a charge / discharge condition of the power storage unit according to the operation plan based on the operation plan received from the power management means and the physical quantity acquired from the measurement unit;
Transmitting the state of the power storage unit and the determined charging / discharging conditions to the power management unit, and causing the state diagnosis unit to execute
In the calculation step, the control condition is calculated using the read operation plan information and the received state of the power storage unit and the charge / discharge condition.

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