KR20210032940A - Electric power management system using a plurality of electric power storage device - Google Patents

Abstract

The present invention relates to a power management system using multiple power storage devices which comprises: multiple power storage devices including at least one battery module; multiple switching control devices configured to correspond one-to-one to each power storage device, and controlling charging and discharging operation of each power storage device; a monitoring control device controlling charging start timing and discharging start timing to be the same or different for each power storage device; and a power storage management device selecting and controlling not to perform the charging or discharging operation for each power storage device. Therefore, charging and discharging control strategies of the power storage devices are optimized to increase charging and discharging efficiency and overall operating efficiency of the power storage devices.

Description

Power management system using multiple power storage devices {ELECTRIC POWER MANAGEMENT SYSTEM USING A PLURALITY OF ELECTRIC POWER STORAGE DEVICE}

The present invention relates to a power management system, and more particularly, to a power management system capable of improving the charging/discharging efficiency and overall operation efficiency of the power storage devices by optimizing the charging/discharging control strategy of the power storage devices.

An electric energy storage system is a device that stores electric energy in a battery module including a plurality of battery cells and discharges it as necessary.It is recently used for the purpose of reducing peaks, controlling frequency, and stabilizing renewable output. It is frequently applied to the power system.

In such a conventional electric energy storage device, a plurality of battery cells are divided and assembled in module units, so that a plurality of battery modules charge electric energy according to a separate energy management module or switching control of an energy management system. It is configured to discharge.

In recent years, as a battery cell that can be easily charged regardless of the capacity of the input power to increase the utilization efficiency of the battery module, various types of lithium-ion battery cells containing a graphene composite or containing a graphene composite in an electrode have been used. It is used for battery modules, etc.

However, even if a battery cell using a graphene composite is used, there is a risk of overcharging, so during the period of charging a plurality of battery modules, it is necessary to check whether each battery module is fully charged or overcharged in real time to control its operation. do.

However, in many battery modules, the charging or discharging completion period is inevitably different from each other depending on the characteristics such as each capacity, usage, and usage period, and thus, the charging/discharging speed and the charging period (period until completion of charging) The lights were all different for each battery module.

Accordingly, in order to prevent accidents due to overcharging, the conventional energy management module or system has no choice but to stop charging all of the remaining battery modules when a certain number of battery modules among a plurality of battery modules are fully charged or overcharged.

As described above, if the entire battery modules cannot be completed or the charge/discharge period is not properly managed to prevent accidents due to overcharging, the energy management efficiency of the energy management system is inevitably lowered, and the use life of the battery modules is also affected. It has no choice but to have an adverse effect.

An object of the present invention is to solve the above problems, and to provide a power management system capable of improving the charging/discharging efficiency and overall operation efficiency of power storage devices by optimizing the charging/discharging timing control strategy of power storage devices. .

In particular, to provide a power management system capable of efficiently controlling the charging/discharging operation of each power storage device by monitoring the charging/discharging time for each power storage device including a plurality of battery cells, and using the monitoring result. have.

In addition, the purpose of this is to provide a power management system that can selectively control whether or not to operate (on/off) and idle period for each power storage device by reflecting conditions such as differences in charge/discharge periods for each power storage device. .

The problems to be solved according to an embodiment of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The power management system according to the embodiment of the present invention for achieving the above-described technical problem is configured to correspond to a plurality of power storage devices including at least one battery module, each power storage device one-to-one, so that each power storage device A plurality of switching control devices for controlling the charging and discharging operations of the plurality of power storage devices; And a power storage management device that selects and controls not to perform a charging or discharging operation for each power storage device.

The monitoring control device detects and stores the time required to fully charge for each of the plurality of power storage devices by preset date or time, and uses information on the time taken to charge to charge each power for each charging and discharging period of the plurality of power storage devices. The charging and discharging start timings for each storage device are controlled to be the same or different from each other.

The monitoring control device uses the information on the time taken to fully charge in reverse order, and the power storage device with the longest time to fully charge starts charging first, and the power storage device with the shortest time to charge sequentially starts charging at the end. By setting the priority so that charging is performed, the plurality of power storage devices are charged at the same timing.

The monitoring control device uses information on the time taken to fully charge, so that the power storage device with the shortest time to fully charge and the fastest power storage device starts discharging first, and the power storage device with the longest sequential charge time starts discharging at the end. By setting a priority and controlling the discharge to be performed, the idle periods of the power storage devices are made different from each other during the discharge period.

The monitoring control device sets the pause period and the number of pauses during the discharge period to be different for each power storage device by using information on the time taken to full charge, and controls each power storage device to stop the operation at different timings during the discharge period. .

The power management system according to an embodiment of the present invention having various technical features as described above can optimize the charging and discharging timing control strategy of power storage devices, and accordingly, the charging/discharging efficiency and overall operation efficiency of the power storage devices. There is an effect that can be increased.

In addition, by optimizing a strategy for controlling the charge/discharge timing of the power storage devices, it is possible to increase the safety of use of the power storage devices including each battery cell.

In addition, by selectively controlling the operation status (on/off) and the idle period according to the charging delay period of each power storage device derived from the comparison result of the charging/discharging period of each power storage device, each battery cell and power storage The life expectancy of the device can be further improved.

The effects according to the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a power management system using a plurality of power storage devices according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the monitoring control device shown in FIG. 1 in detail.
FIG. 3 is a diagram illustrating a method of extracting a charging delay period of the charge/discharge monitor unit shown in FIG. 2.
FIG. 4 is a diagram illustrating a method of controlling a charging order of a charging order setting unit illustrated in FIG. 2.
FIG. 5 is a diagram illustrating a method of controlling a discharge order of a discharge order setting unit illustrated in FIG. 2.
6 is a view for explaining a pause setting method of the pause setting unit shown in FIG. 2.
FIG. 7 is a block diagram showing the power storage management apparatus shown in FIG. 1 in detail.
FIG. 8 is a diagram illustrating a method of controlling an operation of a power storage device by a storage device selection unit illustrated in FIG. 7.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, a person of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted.

Hereinafter, it means that any other module or component, such as a unit or device, is disposed on the “top (or bottom)” of the component. In addition to being disposed in contact with the upper surface (or lower surface), it may mean that another configuration may be interposed between the component and an arbitrary component disposed on (or under) the component. In addition, the same reference numerals in the drawings are used to indicate the same or similar elements.

Hereinafter, a power management system using a plurality of power storage devices according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a power management system using a plurality of power storage devices according to an embodiment of the present invention.

The power management system shown in FIG. 1 includes a plurality of battery cells (BS), a plurality of power storage devices (SM1 to SMn), a plurality of switching control devices (SC1 to SCn), a monitoring control device (MCU), and power storage management. It includes a device (BMU). Here, n is a natural number greater than or equal to 1 excluding 0.

The plurality of power storage devices SM1 to SMn are each configured to include a plurality of battery cells BS or at least one battery module including at least one battery cell.

The plurality of battery cells (BS) included in each battery module may be composed of various types of lithium-ion battery cells in which a graphene composite is contained or a graphene composite is included in an electrode. The plurality of battery cells BS may be connected in parallel so as to correspond to at least one switching control device SC1 to SCn one-to-one. Each battery cell BS may be configured with a combination of series/parallel connection, not just a simple series/parallel structure.

The constituent components of the plurality of battery cells (BS) included in each battery module include at least one component of graphene composite, lithium ion, iron phosphate, polymer, zinc, and vanadium. Electric energy is charged/discharged by a chemical reaction. Accordingly, it is preferable to control the charging/discharging operation of each battery module in consideration of internal chemical characteristics.

Each power storage device (SM1 to SMn) including at least one battery module has the power of the power system produced by a power plant or a generator according to the switching control of each switching control device (SC1 to SCn) connected to correspond to each other in a one-to-one correspondence. To charge. In addition, the electric power charged according to the switching control of each of the switching control devices SC1 to SCn may be discharged to a load terminal or a distribution system such as a general customer to supply power to the load terminal.

A plurality of switching control devices (SC1 to SCn) are configured to correspond to each power storage device (SM1 to SMn) one-to-one, and charge each power storage device (SM1 to SMn) according to the control signal of the monitoring control device (MCU). And control the discharge operation. Specifically, each of the switching control devices (SC1 to SCn) is the power storage device (SM1 to SMn) in accordance with the charge, discharge, pause (turn-off) control signal of the monitoring control device (MCU). It controls charge and discharge operation and turn-off operation.

In addition, each of the switching control devices (SC1 to SCn) detects the amount of charge charged in each of the power storage devices (SM1 to SMn) connected one-to-one in real time and transmits it to the monitoring control device (MCU). In addition, the amount of charge power (hereinafter, the amount of charge) of each power storage device (SM1 to SMn) that is charged during the charging period, and the amount of discharge power (hereinafter, the amount of discharge) of each power storage device (SM1 to SMn) that is discharged during the discharge period It is detected in real time and transmitted to the monitoring control unit (MCU).

The monitoring control unit (MCU) monitors the amount of charge and the amount of power for each power storage device (SM1 to SMn) in real time through each of the switching control units (SC1 to SCn). And, based on the monitored results, each power storage device (SM1 to SMn) includes a period until completion of charging (hereinafter, fully charged), a period until complete discharge, and a period in which charging is delayed compared to at least one power storage device. It detects a plurality of period information for each preset date or time.

Accordingly, the monitoring control unit (MCU) uses period information such as a period until fully charged or a charging delay period, and each power storage device (SM1 to SMn) for each charging period and discharging period of the entire power storage devices SM1 to SMn. The charging and discharging start timings are controlled to be the same or different for each.

In addition, the monitoring control unit (MCU) uses period information such as the period until fully charged or the charging delay period in reverse order, so that the power storage device with the longest charging time starts charging first and the time it takes to sequentially charge. You can control charging to take place by setting a priority so that the shortest power storage device starts charging the last time. In this case, the monitoring control device (MCU) may control the plurality of power storage devices SM1 to SMn to be fully charged at the same timing.

In addition, the monitoring control unit (MCU) uses period information such as the period until full charge or charge delay in reverse order, and the power storage device with the shortest time to charge and the fastest power storage device starts discharging first and then takes sequential charge. It is possible to control discharging to be performed by setting a priority so that the power storage device, which has had the longest time, starts discharging at the end. In this case, the monitoring control unit (MCU) may control the rest periods of the power storage devices SM1 to SMn to be different from each other during the discharge period.

Since each of the power storage devices SM1 to SMn performs charging/discharging using chemical characteristics, the discharge period is inevitably shortened if the power storage devices SM1 to SMn are continuously discharged linearly. Accordingly, if each power storage device (SM1 to SMn) has a rest period in units of a predetermined period according to period information such as a period until full charge or a charge delay period, so that non-linear discharge occurs, each time after the idle period A chemical recovery effect occurs. Due to this chemical recovery effect, the discharge period of each power storage device SM1 to SMn repeatedly having a dormant period becomes longer than when only linear discharge is performed.

Accordingly, the monitoring control unit (MCU) stores the idle period (turn-off period) and the number of pauses (turn-off number) during the discharge period by using period information such as a period until full charge or charge delay period. It is possible to set differently for each of the devices SM1 to SMn, and control the power storage devices SM1 to SMn to stop operating at different timings during the discharge period.

Since the increase of the idle period of each power storage device (SM1 to SMn) leads to an effect of extending the life of the battery module, in order to increase the lifespan while increasing the discharge efficiency of each power storage device (SM1 to SMn), the pause operation is performed in units of a predetermined period. It is desirable to allow this to be done.

Detailed components of the monitoring control unit (MCU) and detailed operations of the major components will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing the configuration of the monitoring control device shown in FIG. 1 in detail.

The monitoring control unit (MCU) shown in FIG. 2 includes a timer 101, a charge/discharge monitor unit 102, a memory 103, a charge/discharge control unit 104, a charge order setting unit 105, and a discharge order setting. A unit 106, a load power detection unit 107, and a pause setting unit 108 are included.

The charge/discharge monitor unit 102 uses the time information of the timer 101 as well as the period taken to charge each power storage device (SM1 to SMn) through a plurality of switching control devices (SC1 to SCn), complete discharge. A plurality of period information including a period of time, a period in which charging is delayed compared to at least one power storage device, and the like are detected for each preset date or time.

FIG. 3 is a diagram illustrating a method of extracting a charging delay period of the charge/discharge monitor unit shown in FIG. 2.

Referring to FIG. 3, the charge/discharge monitor unit 102 determines the time required to fully charge for each power storage device SM1 to SMn during the charging period of the entire power storage devices SM1 to SMn that are simultaneously performed. B. It is detected by time (for example, at 0 o'clock on a day or every day).

For example, the charge/discharge monitor unit 102 may detect the time taken to fully charge for each power storage device (SM1 to SMn) from 0 o'clock every day when the entire power storage devices SM1 to SMn are simultaneously charged. have.

Then, the charge/discharge monitor unit 102 of the monitoring control unit (MCU) additionally takes the time ( That is, the charge delay period) is calculated. In other words, the charging/discharging monitor unit 102 detects the charging delay period for each remaining power storage device based on the charging time of any one power storage device (SM2) that is most quickly charged during the simultaneous charging period as a reference time. do.

Therefore, the charging delay period of the power storage device SM1 is a period corresponding to the remaining time by subtracting the charging time of the fastest charged power storage device SM2 from the time taken until the power storage device SM1 is fully charged. .

Alternatively, the charge/discharge monitor unit 102 may monitor a charge amount and a charge ratio for each power storage device SM1 to SMn to detect a charge delay period for each power storage device SM1 to SMn.

Specifically, the charging/discharging monitor unit 102 is based on the charging time of any one power storage device (SM2) that is most quickly charged during the charging period, and the remaining power storage devices at that time (fastest charging time). Detects and checks the star charge rate (and delay charge rate). In addition, by converting the remaining delayed charging ratio according to the charging amount ratio for each remaining power storage device to a preset delay time, it is possible to detect the charging delay period for each remaining power storage device.

That is, the charge ratio is 68% and the one-to-delay charge ratio is 32%, and the charge delay period corresponding to the 32% charge ratio may be 96 minutes (when 1% charge takes 3 minutes as a result of the experiment) set in advance as an experimental value.

The memory 103 stores and shares a plurality of period information including a charge period, a discharge period, and a charge delay period for each power storage device SM1 to SMn in units of a preset period for each date.

The charging priority setting unit 105 uses a plurality of period information for each power storage device SM1 to SMn stored in the memory 103 to each power storage device SM1 for each charging period of the plurality of power storage devices SM1 to SMn. To SMn), the charging start timing may be set to be the same as or different from each other.

FIG. 4 is a diagram illustrating a method of controlling a charging order of a charging order setting unit illustrated in FIG. 2.

Referring to FIG. 4, the charging priority setting unit 105 arranges and applies the charging delay period information for each of a plurality of power storage devices SM1 to SMn in reverse order, thereby charging priority for each power storage device SM1 to SMn. (Priority) is rearranged and reset in correspondence with the reverse order of charge delay periods for each of the power storage devices SM1 to SMn, respectively.

Accordingly, the charging order setting unit 105 causes the power storage device SMn, which has been charged the latest, to start charging first according to the arrangement order (starting from '0') of the shortest charging delay period information, and then each After the charging start timing for each power storage device SM1 to SMn is delayed in order according to the charging delay period (information) of, a priority charging order may be set so that charging starts. Accordingly, the charge/discharge control unit 104 may control the charging start timing for each of the power storage devices SM1 to SMn by sequentially generating charging control signals according to the priority charging order and charging delay period information.

In this way, in the charging order setting unit 105, the power storage device SMn having the longest charging delay period starts charging first, and the power storage device SM2 that has been charged the fastest with a charging delay period of '0' is the most. The priority is reset to start charging later, and the short charging delay period information starting from '0' is sequentially applied to all the power storage devices SM1 to SMn that have been sequentially rearranged to control charging to start. In this case, the buffering timing of all the power storage devices SM1 to SMn can be matched as much as possible, and the entire power storage devices SM1 to SMn can be fully charged, thereby improving the operating efficiency of the entire power storage devices SM1 to SMn. You can increase it.

FIG. 5 is a diagram illustrating a method of controlling a discharge order of a discharge order setting unit illustrated in FIG. 2.

Referring to FIG. 5, the discharge priority setting unit 106 arranges and applies charge delay period information for each of a plurality of power storage devices SM1 to SMn in the correct order, thereby discharging each power storage device SM1 to SMn. The order (priority) is arranged and set in correspondence with each of the charge delay periods for each of the power storage devices SM1 to SMn, respectively.

Accordingly, the discharge order setting unit 106 causes the power storage device SM2 that has been charged the fastest to start discharging first according to the arrangement order (starting from '0') of the shortest charging delay period information, and then each After the discharge start timing for each of the power storage devices SM1 to SMn is delayed in order according to the charge delay period (information) of, the discharge order may be set so that the discharge starts. Accordingly, the charge/discharge control unit 104 may control the charging start timing for each of the power storage devices SM1 to SMn by sequentially generating charge control signals according to the priority discharge order and charge delay period information.

In this way, in the discharge order setting unit 106, the power storage device SM2 having the shortest charging delay period starts discharging first, and the power storage device SMn having the longest charging delay period starts discharging the last. The discharging priority is set so that the discharging is started by sequentially applying information on the short charge delay period starting from '0' to all the power storage devices SM1 to SMn which are sequentially arranged in priority. In this case, the most efficient power storage device by repeating so that the rest periods of all the power storage devices (SM1 to SMn) are different from each other during the total discharge period, and the power storage device with the fastest charging is discharged first and then recharged again. Can be used most efficiently.

The load power detection unit 107 detects the amount of load power of the load end, and compares the detected amount of load power of the load end with the amount of power output from the plurality of power storage devices SM1 to SMn in real time.

6 is a view for explaining a pause setting method of the pause setting unit shown in FIG. 2.

6, the pause setting unit 108 differently sets the pause period and the number of pauses during the discharge period for each power storage device SM1 to SMn using charge delay period information, and sets each power storage device ( The pause information for each SM1 to SMn) may be transmitted to the charge/discharge control unit 104.

In a specific discharge period in which the amount of power to be discharged is higher than the amount of power output from the plurality of power storage devices (SM1 to SMn), the charge of each power storage device (SM1 to SMn) is delayed because the amount of power to be discharged is required to be high. Electric power cannot be discharged only according to the period order. In this case, the order of discharge of the entire power storage devices SM1 to SMn should be distributed as evenly as possible, and the discharge amount should be maintained on an average basis.

At this time, the pause setting unit 108, if the load power amount of the load stage is higher than the amount of power output from the plurality of power storage devices (SM1 to SMn), the number of pauses for each power storage device (SM1 to SMn) and the number of pauses Each period is set and transmitted to the charge/discharge control unit 104.

Specifically, the pause setting unit 108 divides the charge delay period detected for each power storage device (SM1 to SMn) by the charge delay order of each power storage device (SM1 to SMn), so that each power storage device ( Each power storage device (SM1 to SMn) is set to each power storage device (SM1 to SMn) so that the divided operation period and the corresponding idle period are applied according to the number of pauses corresponding to the charging delay order.

For example, the pause setting unit 108 divides the charge delay period '102 minutes' of the first power storage device SM1 by the charge delay priority '6th', Set the number of pauses '6 times' corresponding to the charge delay order and the pause period '17 minutes' for each number of pauses (6 times).

In this way, when the load power amount of the load stage is higher than the amount of power output from the plurality of power storage devices SM1 to SMn, the order of discharging of the entire power storage devices SM1 to SMn is the respective charging delay order (number of pauses) and charging. It is possible to control the discharge amount to be maintained on an average by making it distributed as evenly as possible according to the delay period (rest period).

The charge/discharge control unit 104 includes charging start timing information for each power storage device (SM1 to SMn) set by the charging priority setting unit 105, and each power storage device (SM1 to SMn) set by the discharge priority setting unit 106 The charging and discharging start timings of the power storage devices SM1 to SMn are controlled to be the same or different from each other for each charging period and the discharging period of the power storage devices SM1 to SMn according to the discharge start timing information.

In addition, the charge/discharge control unit 104 is configured for each discharge period of the entire power storage devices SM1 to SMn according to the pause period and the number of pauses setting information for each power storage device SM1 to SMn set by the pause setting unit 108. It is possible to control the idle operation (turn-off operation) to proceed for each power storage device SM1 to SMn.

FIG. 7 is a block diagram showing the power storage management apparatus shown in FIG. 1 in detail.

The power storage management device BMU shown in FIGS. 1 and 7 selects and controls each power storage device SM1 to SMn so as not to perform a discharge operation. To this end, the power storage management device (BMU) includes a load power monitor unit 201, a charge/discharge amount monitor unit 202, a storage device selection unit 203, a database 204, and a charge delay period monitor unit 205. , A complete discharge monitor unit 206, a discharge switching setting unit 207, and a charge switching setting unit 208.

Specifically, the load power monitor 201 monitors the load power amount of the load end in real time through the load power detection unit 107, and outputs the detected load power amount of the load end and a plurality of power storage devices SM1 to SMn. The comparison result is monitored in real-time of the amount of power being generated. In addition, a comparison result of the detected load power amount of the load stage and the amount of power output from the plurality of power storage devices SM1 to SMn is stored in the database 204 in real time.

The charge/discharge amount monitor 202 monitors the amount of power output from the plurality of power storage devices SM1 to SMn during the discharge period through the load power detection unit 107 or the like, and stores it in the database 204. In the charging period, the amount of power input to the plurality of power storage devices SM1 to SMn is monitored in real time and stored in the database 204.

The charging delay period monitor 205 monitors the charging delay period for each power storage device SM1 to SMn in real time, and according to the charging delay period monitor result, at least one of the plurality of power storage devices SM1 to SMn The charging or discharging operation of the storage device is set to be stopped for a preset period.

Specifically, the charging delay period monitor unit 205 compares and calculates the information on the charging delay period detected for each of the power storage devices SM1 to SMn in units of a preset date or period, and the respective power storage devices The change time information of the charge delay period is extracted for each (SM1 to SMn). And, after setting the order of each power storage device (SM1 to SMn) in reverse order from small to large change time information, to have a pause period at a number corresponding to the inverse order according to the change time information for a preset period. The number of idle times and periods of each power storage device SM1 to SMn are set.

For example, the charging delay period monitor unit 205 compares the charging delay period for each power storage device SM1 to SMn detected on the first day with the charging delay period detected on the 7th day, and changes corresponding to the difference period. Extract time information. Since charging/discharging efficiency may decrease as the change time information increases, the order of each power storage device SM1 to SMn is set in the order of small change time information. And, by setting the number of pauses and the pause period corresponding to the reverse order according to the change time information for a period of about a month, a power storage device with large change time information (e.g., a total of 6 times divided into 6 days to set the pause period) From to the smallest power storage device (e.g., a total of one pause for one day), the pause period and the number of pauses are set to be applied.

FIG. 8 is a diagram illustrating a method of controlling an operation of a power storage device by a storage device selection unit illustrated in FIG. 7.

Referring to FIG. 8, the storage device selection unit 203 is configured to determine the total number of power storage devices SM1 to SMn according to the number of pauses and period information for each power storage device SM1 to SMn set by the charging delay period monitor unit 205. ) At least one of the power storage devices SM1 to SMn is selected and set not to perform a charging or discharging operation, and the selected information is transmitted to the charging/discharging control unit 104.

The complete discharge monitor unit 206 monitors the amount of power output from the plurality of power storage devices SM1 to SMn during the discharge period through the load power detection unit 107 or the like. In addition, at least one power storage device SM1 to SMn in which complete discharge has progressed is detected among the plurality of power storage devices SM1 to SMn during a predetermined specific period. Subsequently, the complete discharge monitor unit 206 equally multiplies the number of complete discharges for each of the at least one power storage device SM1 to SMn in which the complete discharge has progressed, and a preset threshold value during the complete discharge period. The number of pauses and the pause period for each number of pauses are set for each power storage device SM1 to SMn.

For example, if a specific power storage device (SM1) discharged for a total of 36 minutes for a total of 3 times within a period of one month, the transfer value '3' set in advance in the number of complete discharges of 3 and the discharge period of 36 minutes is set. The same multiplication operation is performed to set the number of pauses '9' and the number of pauses '108 minutes'.

The storage device selection unit 203 is a complete power storage device (SM1 to SMn) according to the number of pauses for each power storage device (SM1 to SMn) set by the complete discharge monitor unit 206 and the maintenance period information for each number of pauses. The power storage devices SM1 to SMn, which have been discharged, are selected and set not to perform a charging or discharging operation, and the selected information is transmitted to the charging/discharging control unit 104. Accordingly, it is possible to reduce the number of times of use of the specific power storage devices SM1 to SMn whose charge/discharge characteristics are degraded due to complete discharge, and control to slowly regenerate.

The discharge switching setting unit 207, when the load power amount of the load end is higher than the amount of power output from the plurality of power storage devices SM1 to SMn, the charging delay period monitor unit 205 or the complete discharge monitor unit 206 As a result, at least one power storage device SM1 to SMn for performing a discharge operation is selected from among the power storage devices SM1 to SMn set to the idle (turn-off state). In other words, when the amount of load power at the load end is higher than the amount of power output from the plurality of power storage devices SM1 to SMn, the discharge switching setting unit 207 From the power storage devices SM1 to SMn in the order of the smallest change time information, a power storage device in the idle state for performing the discharge operation by a preset number corresponding to the size of the increased amount of load power is selected. For example, one power storage device in the idle state can be selected per 120V.

On the other hand, the discharge switching setting unit 207, when the amount of power in the load stage is higher than the amount of power output from the plurality of power storage devices SM1 to SMn, the number of complete discharges detected by the complete discharge monitor unit 206, and From the power storage devices SM1 to SMn in the order of the smallest complete discharge period, a power storage device in a dormant state for performing the discharge operation by a preset number corresponding to the amount of the increased amount of load power may be selected.

The storage device selection unit 203 selects the power storage device in the idle state set in the discharge conversion setting unit 207 to switch to a turn-on state to perform a discharge operation, and charge/discharge the selected information. Transfer to.

The charging conversion setting unit 208 selects at least one power storage device SM1 to SMn for performing a charging operation from among the power storage devices SM1 to SMn in the idle period.

When the amount of load power at the load stage is lower than the amount of power output from the plurality of power storage devices SM1 to SMn, the charge conversion setting unit 208 reduces the amount of discharge of the power storage devices SM1 to SMn, while at rest (turn-down). At least one power storage device SM1 to SMn for separately performing a charging operation is selected from among the power storage devices SM1 to SMn set to off state).

In other words, when the amount of load power at the load stage is lower than the amount of power output from the plurality of power storage devices SM1 to SMn, the charging changeover setting unit 208 determines the charging delay period detected by the charging delay period monitor unit 205. From the power storage devices SM1 to SMn in the order of the smallest change time information of, an idle power storage device for performing a charging operation by a preset number corresponding to the size of the lowered amount of load power is selected. For example, it is possible to select and charge one power storage device in a dormant state for each 120V that decreases.

On the other hand, the charge switching setting unit 208, when the amount of the load power at the load stage is lower than the amount of power output from the plurality of power storage devices SM1 to SMn, the number of complete discharges detected by the complete discharge monitor unit 206, and From the power storage devices SM1 to SMn in the order of the smallest discharge period, a power storage device in a dormant state for performing a discharge operation by a preset number corresponding to the size of the lowered amount of load power may be selected. You can select and charge one power storage device in the dormant state for each 120V that decreases.

The storage device selection unit 203 selects the power storage device in the idle state set in the charging conversion setting unit 208 to switch to a turn-on state to perform a charging operation, and then charge/discharge the selected information. Transfer to.

The power management system according to the embodiment of the present invention having various technical features as described above can optimize the charging and discharging timing control strategy of the power storage devices SM1 to SMn, and the charging/discharging efficiency of the power storage devices accordingly. And it is possible to increase the overall operational efficiency.

In addition, by optimizing the charging/discharging timing control strategy of the power storage devices SM1 to SMn, it is possible to increase the safety of use of the power storage devices having respective battery cells.

In addition, by selectively controlling the operation status (on/off) and the idle period according to the charging delay period of each power storage device derived from the comparison result of the charging/discharging period of each power storage device (SM1 to SMn), each It is possible to further improve the life expectancy of battery cells and power storage devices.

As described above with reference to the drawings illustrated for the present invention, the present invention is not limited by the embodiments and drawings disclosed in the present specification, and various by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformations can be made. In addition, even if not explicitly described and described the effects of the configuration of the present invention while describing the embodiments of the present invention, it is natural that the predictable effects of the configuration should also be recognized.

BS: multiple battery cells
SM1 to SMn: first to nth power storage devices
SC1 to SCn: first to nth switching control device
MCU: monitoring control device
BMU: Power storage management unit

Claims (5)

A plurality of power storage devices including a plurality of battery cells or at least one battery module including at least one battery cell;
A plurality of switching control devices configured to correspond to each of the power storage devices one-to-one to control charging and discharging operations of each of the power storage devices;
A monitoring control device for controlling a charging start timing and a discharge start timing for each of the plurality of power storage devices to be the same or different from each other; And
Monitors the comparison result in real time of the amount of load power at the load stage and the amount of power output from the plurality of power storage devices, and extracts change time information of the charging delay period for each of the plurality of power storage devices in units of a preset date or period, And a power storage management device that selects and controls not to perform a charging or discharging operation for each of the power storage devices according to change time information of a charge delay period for each of the plurality of power storage devices.
The method of claim 1,
The monitoring control device
A charge/discharge monitor configured to detect a plurality of period information including a charge period and a discharge period for each power storage device by a preset date or time through the plurality of switching control devices;
A memory for storing and sharing a plurality of period information including a charging period and a discharging period for each of the power storage devices;
A charging priority setting unit configured to set the charging start timing for each of the power storage devices to be the same or different from each other according to the plurality of period information;
A discharge order setting unit configured to set the same or different discharge start timing for each of the power storage devices according to the plurality of period information;
A load power detector configured to detect the amount of load power at the load end, compare it with the amount of power output from the plurality of power storage devices in real time, and output the comparison result;
A pause setting unit configured to differently set a pause period and a pause number during a discharge period according to the plurality of period information for each of the power storage devices; And
And a charging/discharging control unit configured to control charging and discharging start timings for each of the power storage devices in the same or different manner for each of the charging period and the discharging period according to the set charging start timing, discharging start timing, pause period, and pause number , Power management system. The method of claim 2,
The power storage management device
A load power monitor unit that monitors the amount of load power at the load stage in real time;
A charge/discharge amount monitor for monitoring in real time an amount of power output from the plurality of power storage devices during a discharge period and an amount of power input to the plurality of power storage devices during a charging period;
Charging delay in which at least one power storage device among the plurality of power storage devices does not perform a charging or discharging operation according to a monitoring result of the charging delay period by monitoring a charging delay period among the plurality of period information in real time Period monitoring unit;
A complete discharge monitor unit for detecting at least one power storage device in which complete discharge is performed during a discharge period among the plurality of power storage devices;
Including a discharge switching setting unit for selecting at least one power storage device for performing a discharge operation among the power storage devices in the idle period,
Power management system. The method of claim 3,
The power storage management device
A charging conversion setting unit for selecting at least one power storage device for performing a charging operation among power storage devices in the idle period;
A storage device selection unit that selects and sets at least one of the plurality of power storage devices not to perform a charging or discharging operation, and transmits information on the selected power storage devices to the charging/discharging control unit. doing,
Power management system. The method of claim 1,
The monitoring control device
Detecting and storing the time taken to fully charge for each of the plurality of power storage devices according to a preset date or time,
Using the information on the time taken until the full charge to set the rest period and the number of times of rest during the discharge period differently for each power storage device, and controlling each power storage device to stop the operation at different timings during the discharge period,
Power management system

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