KR20240082311A - Energy storage system including newly installed battery racks and method controlling the same - Google Patents

Abstract

An energy storage system according to an embodiment of the present invention includes a plurality of first battery racks; a plurality of battery protection units each managing the plurality of first battery racks; a plurality of second battery racks; A plurality of DC/DC converters each managing the plurality of second battery racks; and monitoring outputs of the plurality of battery protection units and the plurality of DC/DC converters in conjunction with the plurality of battery protection units and the plurality of DC/DC converters, and controlling the output of the plurality of DC/DC converters. , may include a battery section control device.

Description

Energy storage system including newly installed battery racks and method for controlling the same {ENERGY STORAGE SYSTEM INCLUDING NEWLY INSTALLED BATTERY RACKS AND METHOD CONTROLLING THE SAME}

The present invention relates to an energy storage system and a method of controlling an energy storage system, and more specifically, to an energy storage system and a method of controlling an energy storage system including a battery rack that is newly or temporally installed later. .

The Energy Storage System (ESS) is a system that links renewable energy, batteries that store power, and existing grid power. Recently, as the spread of smart grids and new and renewable energy has expanded and the efficiency and stability of the power system has been emphasized, the demand for energy storage systems is increasing to control power supply and demand and improve power quality. . Depending on the purpose of use, the output and capacity of the energy storage system may vary. Multiple battery systems can be connected to each other to form a large-capacity energy storage system.

In the energy storage system, the performance of some battery racks may deteriorate over time, and accordingly, the performance can be supplemented by adding new battery racks to existing battery racks. In this case, there is a performance difference between the newly added rack and the existing installed rack, and due to this performance difference between the racks, unnecessary rack balancing may be repeated. This causes the problem that the new battery rack follows the performance of the existing rack even though a new battery rack was added to improve performance. In other words, even though a new battery rack is added, a problem arises in which the maximum performance (e.g., rated capacity, period of use, etc.) of the new battery rack cannot be utilized.

Korean Patent Publication No. 10-2016-0094228

The purpose of the present invention to solve the above problems is to provide an energy storage system including an existing battery rack and a new battery rack.

Another object of the present invention to solve the above problems is to provide a device for controlling a battery system including an existing battery rack and a new battery rack.

Another purpose of the present invention to solve the above problems is to provide a method of controlling an energy storage system including existing battery racks and new battery racks.

An energy storage system according to an embodiment of the present invention for achieving the above object includes one or more first battery racks; one or more second battery racks; One or more DC/DC converters each controlling the second battery rack; And a battery system control device that monitors the output of the first battery rack and the DC/DC converter in conjunction with the first battery rack and the DC/DC converter and controls the output of the DC/DC converter. there is.

The first battery rack is not connected to the DC/DC converter, so output control according to the state of the first battery rack is impossible, and the second battery rack is controlled through output control of the second battery rack using the DC/DC converter. 2 Battery racks can reinforce the performance of the first battery rack.

Here, the battery system control device detects the output power value of the first battery rack operating according to a charging or discharging command of the energy storage system, and output power value of the first battery rack, the first battery rack The output power value to be output by the second battery rack can be calculated using the information of and the information of the second battery rack.

The information on the second battery rack may include one or more of the number of the second battery racks, State of Health (SOH), State of Charge (SOC), output current, output power, and temperature.

The battery system control device may calculate the output weight of each second battery rack using information about the second battery rack.

The battery system controller also calculates the total power for the second battery rack based on the output power values of the first battery rack and the second battery rack, the quantity information of the first battery rack, and the quantity information of the second battery rack. The command value can be calculated.

The battery system control device may calculate an individual power command value for each second battery rack based on the output weight for each second battery rack and the total power command value for the second battery rack.

The battery system control device may stop the output of the DC/DC converter when the output of the PCS (Power Conversion System) indicates the stop of charging and discharging operation.

The charging or discharging command may be transmitted from the EMS (Energy Management System) of the energy storage system to the PCS.

Meanwhile, the second battery rack and the DC/DC converter may be additionally placed and operated in the energy storage system after the first battery rack is installed and operated in the energy storage system.

A battery system control device according to an embodiment of the present invention for achieving the above other object is linked with one or more first battery racks and one or more second battery racks, and includes at least one processor; and a memory storing at least one command executed through the at least one processor, wherein the at least one command is one or more DCs for controlling the one or more first battery racks and the one or more second battery racks, respectively. /command to monitor the output of a DC converter; And it may include a command to control the output of the one or more DC/DC converters according to the monitoring results.

Here, the first battery rack is not connected to the DC/DC converter and cannot control the output according to the state of the battery rack, and the second battery rack and the DC/DC converter are added after the first battery rack is installed. When disposed within a raw energy storage system, the second battery rack can reinforce the performance of the first battery rack.

At this time, the command to monitor the output of the one or more first battery racks and the one or more DC/DC converters is to detect the output power value of the first battery rack operating according to the charging or discharging command of the energy storage system. It may contain commands that do.

In addition, the command to control the output of the DC/DC converter according to the monitoring result uses the output power value of the first battery rack, information on the first battery rack, and information on the second battery rack, It may include instructions for calculating an output power value to be output by each of the one or more second battery racks.

The command to control the output of the DC/DC converter according to the monitoring result also includes output power values of the first battery rack and the second battery rack, quantity information of the first battery rack, and the second battery rack. Instructions for calculating a total power command value for one or more second battery racks based on the quantity information; and instructions for calculating an individual power command value for each second battery rack based on the output weight for each second battery rack and the total power command value for the one or more second battery racks. .

The charging or discharging command may be transmitted from an EMS (Energy Management System) to a PCS (Power Conversion System).

Meanwhile, the second battery rack and the DC/DC converter may be additionally placed and operated in the energy storage system after the first battery rack is installed and operated in the energy storage system.

A control method of an energy storage system according to an embodiment of the present invention for achieving the other object includes managing one or more first battery racks, one or more second battery racks, and the one or more second battery racks, respectively. A method of controlling an energy storage system including one or more DC/DC converters, comprising: monitoring outputs of the one or more first battery racks and the one or more DC/DC converters; detecting an output power value of the one or more first battery racks operating according to a charging or discharging command of the energy storage system; Using the output power value of the one or more first battery racks, the information of the one or more first battery racks, and the information of the one or more second battery racks, calculating the output power value to be output by the one or more second battery racks step; And it may include controlling the output of the one or more DC/DC converters according to the calculated output power value.

Here, the one or more first battery racks are not connected to the DC/DC converter and cannot control the output according to the state of the battery rack, and the second battery rack and the one or more DC/DC converters are connected to the first battery rack. After being installed and further placed within the energy storage system, the second battery rack can reinforce the performance of the first battery rack.

The step of calculating the output power value to be output by the one or more second battery racks includes output power values of the first battery rack and the second battery rack, quantity information of the first battery rack, and quantity of the second battery rack. Based on the information, calculating a total power command value for the one or more second battery racks; and calculating an individual power command value for each second battery rack based on the output weight for each second battery rack and the total power command value for the one or more second battery racks.

Meanwhile, the information on the one or more second battery racks may include one or more of the number of the one or more second battery racks, SOH, SOC, output current, output power, and temperature.

The control method of the energy storage system may further include stopping the output of the one or more DC/DC converters when the output of the PCS (Power Conversion System) indicates the stop of charging and discharging operation.

The charging or discharging command may be transmitted from an EMS (Energy Management System) to the PCS.

Meanwhile, the second battery rack and the DC/DC converter may be additionally placed and operated in the energy storage system after the first battery rack is installed and operated in the energy storage system.

According to the embodiment of the present invention as described above, when adding a new battery rack to an energy storage system, unnecessary or excessive rack balancing can be prevented or reduced.

Accordingly, the performance of the new battery rack can be utilized to its full potential (e.g., 100%).

In addition, the present invention allows the system to be operated like the existing system by only modifying the firmware of the BSC without modifying the firmware of the PCS and PMS.

1 is a block diagram of an existing energy storage system.
Figure 2 is a block diagram of an energy storage system according to an embodiment of the present invention.
Figure 3 shows the relationship between the output command value and the output value in each battery area when starting and stopping the energy storage system according to an embodiment of the present invention.
Figure 4 illustrates the concept of calculating the output control weight of each DC/DC converter in the augmentation area according to an embodiment of the present invention.
Figure 5 is an operation flowchart of a control method of an energy storage system according to an embodiment of the present invention.
Figure 6 is a schematic block diagram of a battery system control device according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Some terms used in this specification are defined as follows.

SOC (State of Charge; Charging Rate) expresses the current charged state of the battery as a percentage [%], and SOH (State of Health; Remaining Rate) expresses the current remaining state of the battery as a percentage [%].

Battery Rack refers to a system with a minimal single structure that can be monitored and controlled through BMS by connecting module units set by the battery manufacturer in series/parallel, and includes multiple battery modules and one BPU or protection device. It can be configured.

A battery bank may refer to a group of large-scale battery rack systems consisting of connecting multiple racks in parallel. Monitoring and control of the rack BMS (RBMS) at the battery rack level can be performed through the BMS at the battery bank level.

BSC (Battery Section Controller) is a device that performs top-level control of the battery system, including the battery system at the battery bank level, and is also used as a control device in battery systems with multiple bank level structures.

Nominal Capacity (Nominal Capa.) may refer to the battery's set capacity [Ah] set by the battery manufacturer during development.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

1 is a block diagram of an existing energy storage system.

The smallest unit of a battery that stores power in an energy storage system (ESS) is usually a battery cell. A series/parallel combination of battery cells forms a battery module, and multiple battery modules can form a battery rack. In other words, a battery rack can be the minimum unit of a battery system by combining battery modules in series/parallel. Here, depending on the device or system in which the battery is used, the battery rack may also be referred to as a battery pack.

Referring to FIG. 1, one battery rack may include a plurality of battery modules and one BPU 10 or a protection device. Battery racks can be monitored and controlled through RBMS (Rack BMS). RBMS monitors the current, voltage, and temperature of each battery rack it oversees, calculates the SOC (Status Of Charge) of the battery based on the monitoring results, and controls charging and discharging.

Meanwhile, the BPU (Battery Protection Unit) 10 is a device to protect the battery from abnormal current and fault current in the battery rack unit. The BPU 10 may include a main contactor (MC), a fuse, a circuit breaker (CB), or a disconnect switch (DS). The BPU can control the battery system on a rack basis by controlling the main contactor on/off according to the control of the RBMS. The BPU can also protect the battery from short-circuit current using a fuse in the event of a short circuit. In this way, existing battery systems can be controlled through protection devices such as BPU and switchgear.

Meanwhile, a battery system controller (BSC) 20 is installed in each battery section including a plurality of batteries and peripheral circuits and devices to monitor and control control objects such as voltage, current, temperature, and circuit breaker. can do. The BSC 20 is a top control device of a battery system including a bank-level battery system including a plurality of battery racks, and is also used as a control device in a battery system with a multiple bank-level structure.

In addition, the power conversion system (PCS) 40 installed in each battery section is a device that performs actual charging and discharging based on charging/discharging commands from the EMS, and is comprised of a power conversion unit (DC/AC inverter) and a controller. It may be configured to include. Meanwhile, the output of each BPU can be connected to the PCS 40 through a DC bus, and the PCS 40 can be connected to the grid. In addition, EMS (Energy Management System)/PMS (Power Management System) 30 manages the ESS system as a whole.

In the conventional battery system as shown in Figure 1, the battery system is controlled only through protection elements such as BPU and switch gear, and individual control is performed considering individual characteristics of the battery system such as battery capacity, SOH, and SOC. is impossible.

In this energy storage system, multiple battery racks serve as voltage sources, and the PCS charges and discharges the battery racks through CC (Constant Current) control or CP (Constant Power) control. When the battery rack is initially installed, the performance of the battery racks is almost similar (similar resistance values are shown when expressed in equivalent resistance) and the charging and discharging current of each rack is at a similar level. However, some racks may show performance degradation over time. In this case, performance is supplemented by adding a new battery rack, which is called augmentation.

At this time, there may be a performance difference between the newly added rack (which may be referred to as the second battery rack) and the existing installed rack (which may be referred to as the first battery rack), and according to the existing control method, unnecessary or excessive rack As balancing is repeated, a problem arises in which newly added racks follow the degraded performance of existing racks. In other words, even though a new rack is added, the maximum performance (e.g., rated capacity, period of use, etc.) of the new battery rack cannot be fully utilized. In an embodiment of the present invention, the new battery rack includes a newly manufactured battery rack, but a battery rack that is used to reinforce the existing battery rack at a later time, and includes a DC/DC converter for DC/DC conversion. It may also include a rack, which may be a previously used or refurbished battery rack.

Figure 2 is a block diagram of an energy storage system according to an embodiment of the present invention.

Figure 2 shows a system in which a plurality of new battery racks are added to an existing energy storage system. According to an embodiment of the present invention, the existing energy storage system may include characteristics similar to the energy storage system shown in FIG. 1. The existing operating energy storage system includes the EMS (300) and the PCS (400) as seen in FIG. ), BPU (100), battery rack (old rack), and BSC (200). EMS (Energy Management System), also called PMS (Power Management System), manages the ESS system as a whole.

The BSC (Battery Section Controller) 200 can manage the status of each rack and inform the upper system (EMS) of the limit values of batteries that can be output. The BSC 200 may be implemented as mounted and installed on a desktop PC, etc. Additionally, the BSC 200 may be implemented as a separate device or controller. The PCS (400) is a device that performs actual charging and discharging based on charging and discharging commands received from the EMS (300), and may be configured to include a DC/AC power conversion unit and a controller.

On the other hand, when augmentation is performed in which a new battery rack is added to reinforce the existing battery racks in addition to the plurality of battery racks and BPU that were previously operated, that is, the existing battery rack and the new battery are added through augmentation. When racks coexist, if existing control methods are followed, the performance of the new battery rack may rapidly deteriorate or problems such as balancing imbalance between racks may occur.

Therefore, the energy storage system according to an embodiment of the present invention uses a DC/DC converter (within the augmentation area) instead of a BPU for a plurality of newly added battery racks to improve the performance of the newly added battery racks. Reduces or prevents problems such as rapid deterioration and imbalance in balance between racks.

The DC/DC converter 150 may include a main body and a DC/DC controller. The DC/DC converter 150 performs DC/DC conversion between the battery and a power conversion system (PCS).

The DC/DC converter placed in the augmentation area allows the existing and new battery racks to be electrically separated and operated. The output of the DC/DC converter can be actively controlled by the user, allowing battery output control that takes into account the characteristics of each battery rack even if there are differences in SOC, SOH, and capacity between each battery rack.

Each DC/DC converter is connected to the BSC (200) and PCS (400). The BSC 200 can monitor and manage the status of battery racks placed in the augmentation area as well as the battery racks placed in the existing area.

Meanwhile, from the perspective of an end user who uses the services provided by the energy storage system, it is an important issue whether the battery can be driven without changing the existing PCS and EMS.

The present invention provides an augmentation method using a DC/DC converter by only modifying the BSC firmware in the battery area without modifying the firmware of the PCS and EMS.

In an embodiment of the present invention, the new battery racks (New Racks) in the augmentation area are used to strengthen the existing battery racks (Old Racks) and include the DC/DC converter 150 rather than the BPU 100. . Therefore, using the DC/DC converter 150 dedicated to the newly added battery rack (New Rack) in the augmentation area instead of the battery protection unit (BPU) has the advantage of avoiding or reducing rapid deterioration of the newly added battery rack or balancing. can be provided. Additionally, it can provide the advantage of modifying only the BSC firmware in the battery area without modifying the firmware of the PCS or EMS.

First, we will look at the startup sequence of the energy storage system according to the present invention.

Referring to FIG. 2, the EMS 300 transmits a charge/discharge command (Pbat*) to the PCS 300 in the same manner as the existing method. The PCS (300) receives a charge/discharge command (Pbat*) and outputs power corresponding to the command. At this time, power of Pbat* is preferentially (temporarily) output from the BPU racks placed in the existing area.

Here, the BSC 200 is aware of the quantity information of the BPU rack placed in the existing area and the DC/DC rack (used as a concept including the battery rack and DC/DC converter) placed in the augmentation area. . The BSC 200 monitors the total output value (Pbat*) from all battery racks linked with it. Therefore, Pbat* means the total output power required for the BPU rack in the existing area and the DC/DC rack in the expansion area.

Meanwhile, the BSC 200 outputs a new battery rack in the augmentation area based on at least the output value of the battery rack in the existing area, the quantity information of the battery rack in the existing area, and the quantity information of the battery rack in the augmentation area. Calculate the value Paug*.

The BSC 200 also calculates the output weight for each battery rack in the augmentation area based on the status information (SOC, SOH, etc.) of each battery rack located in the augmentation area. The output value of each DC/DC rack can be calculated by multiplying the output weight for each battery rack by Paug*. That is, the BSC 200 calculates the charge/discharge command for the DC/DC converter by considering the remaining energy of the DC/DC rack in the augmentation area compared to the BPU rack in the existing area. The calculated charge/discharge command for the DC/DC converter is transmitted to each DC/DC converter through the communication line 250, and the DC/DC rack outputs power of Paug* value.

In an embodiment of the present invention, the charge/discharge command for the output power (Pbat*) may also be referred to as a directive for the output power (Pbat*). In this regard, the charge/discharge command for the output power may be expressed or symbolized as a value of the output power (Pbat*) required or demanded by the charge/discharge command resulting in the output power (Pbat*). Therefore, Pbat* can be used to express charge/discharge command and output power depending on the situation. Similarly, the charge/discharge command for the output value Paug* can also be said to be an indication for the output value Paug*. In this regard, the charge/discharge command for the output value may be expressed or symbolized as a value of the output value Paug* required or required by the charge/discharge command resulting in the output value Paug*. Therefore, Paug* can be used to specify charge/discharge commands and output values depending on the context.

The series of processes in the startup sequence discussed above are completed within a very short period of time after the output of the PCS is initiated.

Next, we look at the stopping sequence of the energy storage system.

When the system is stopped, the output of PCS (400) becomes 0. In this case, the existing BPU area is a passive element area, so the output of the battery rack changes depending on the output of the PCS. However, the DC/DC area, which is an augmentation area, maintains the output Paug* because it operates under commands from the BSC. That is, for a very short moment, the augmentation area outputs Paug* and the BPU area temporarily accepts the output. In the meantime, the BSC detects that the output toward the PCS has become 0, and modifies the output command value Paug* in the DC/DC area to 0. Through this process, the output of all racks in the BPU area and DC/DC area becomes 0 and system operation stops.

Figure 3 shows the relationship between the output command value and the output value in each battery area when starting and stopping the energy storage system according to an embodiment of the present invention.

In the startup sequence, when the power of Pbat* is output from the battery in the existing area through the PCS that receives the charge/discharge command (Pbat*) from the EMS, the BSC recognizes the corresponding output value Pbat* and connects the battery rack in the augmentation area. This output value, Paug*, is calculated and delivered to the augmentation area.

At the point when the augmentation area outputs the value of Paug*, the battery in the existing area outputs power of (Pbat* - Paug*). At this time, the command value of the PCS is maintained as Pbat*, because the EMS transmits a constant command value Pbat* to the PCS regardless of whether or not there is augmentation. In this way, according to the present invention, PCS and EMS can operate like existing systems, regardless of whether augmentation is performed.

Meanwhile, looking at the stop sequence, the command value of PCS becomes 0 due to system stop. In this case, the existing BPU area is a passive element area, so the output of the battery rack changes depending on the output of the PCS. The DC/DC area, which is the corresponding augmentation area, maintains the output Paug* until it receives a command from the BSC, and controls the output to 0 from the time it receives a stop command from the BSC. During the short time that the augmentation area outputs Paug*, the BPU area temporarily accepts the output (- Paug*). When the output of the DC/DC area becomes 0 due to a stop command from the BSC, the output of the BPU area also becomes 0.

Figure 4 illustrates the concept of calculating the output control weight of each DC/DC converter in the augmentation area according to an embodiment of the present invention.

According to an embodiment of the present invention, the BSC estimates the status of each rack based on information such as SOC and SHO of battery racks placed in the augmentation area, and sets the output weight of each DC/DC rack based on this value. It can be calculated.

Specifically, referring to FIG. 4, the BSC 200 receives data such as SOC, SOH, current, voltage, and temperature of each battery rack from each DC/DC rack. The BSC can use this information to calculate the output weights α ₂ , ... α _n of each DC/DC rack.

Equation 1 below represents the formula for calculating the total output command value P _aug ^* for the augmentation area. In an embodiment of the present invention, the unit of Pbat* and P _aug ^* may be watts (W).

In Equation 1, m is the number or quantity of BPU racks, and n is the number (or quantity) of DC/DC racks. Additionally, Pbat* is the charge/discharge command value received from EMS.

Equation 2 represents an equation for calculating the output command values P _DC/DC-1 ^* to P _DC/DC-n ^* of the DC/DC rack in the augmentation area.

From Equation 2, it can be seen that the output command value of the DC/DC rack is calculated by multiplying the total output command value P _aug ^* for the augmentation area by the weight for each rack. Additionally, the sum of the output weights of each DC/DC rack is 1.

In one embodiment, it is assumed that the battery rack in the augmentation area is of the same type.

If the batteries in the augmentation area are of the same type and have similar SOH, the output weight of battery rack #j when charging Can be expressed as Equation 3 below.

In the above equation ( means the total charging space of all battery racks within the augmentation area, means the chargeable space of battery rack #j to which the corresponding output weight is applied. n is the total number of battery racks in the augmentation area.

Additionally, if the batteries in the augmentation area are of the same type and have similar SOH, the output weight for each rack during discharging may be determined as the ratio of the SOC of the rack to the SOC of all battery racks in the augmentation area. That is, it can be defined as Equation 4 below.

Meanwhile, if the battery model is the same but the battery racks have different SOH, the output weight for each battery rack can be determined by considering not only the SOC of each rack but also the SOH.

For example, the output weight for each battery rack during charging can be defined as Equation 5 below.

Additionally, the output weight for each battery rack when discharging can be defined as in Equation 6 below.

In Equations 3 to 6 above, n, i, and j are integers. Accordingly, the amount of augmented power to be supplied by each new battery rack #j can be provided by the output weight of the new battery rack #j, and the output weight can be included in the charge/discharge command. Figure 5 shows the output weight of the new battery rack #j. This is an operation flowchart of a control method for an energy storage system according to an embodiment.

The control method of the energy storage system according to the present invention includes a plurality of first battery racks, a plurality of battery protection units each managing the plurality of first battery racks, a plurality of second battery racks, and the plurality of second batteries. This may be performed by a battery section controller in an energy storage system comprising a plurality of DC/DC converters each managing a rack.

The battery section control device monitors the outputs of a plurality of battery protection units and the plurality of DC/DC converters (S510).

The battery section control device detects the output power value of the plurality of first battery racks operating according to the charging or discharging command of the energy storage system (S520).

Thereafter, the battery section control device calculates the output power value to be output by the plurality of second battery racks (S530). At this time, the output power value to be output by the second battery rack may be calculated using the output power value of the plurality of first battery racks, information on the plurality of first battery racks, and information on the plurality of second battery racks. . More specifically, the step of calculating the output power value to be output by the plurality of second battery racks includes calculating the output weight of each second battery rack using information about the plurality of second battery racks, and calculating the output power of the second battery rack. A power command value for each second battery rack may be calculated based on the number of the second battery racks compared to the total number of battery racks in the weight and energy storage system. At this time, the information on the plurality of second battery racks may include one or more of the number of the plurality of second battery racks, SOH, SOC, output current, output power, and temperature.

Afterwards, the output of a plurality of DC/DC converters can be controlled according to the calculated output power value (S540).

Figure 6 is a schematic block diagram of a battery system control device according to an embodiment of the present invention.

The battery system control device (or battery section control device) 200 includes at least one processor; and a memory that stores at least one instruction executed through the at least one processor.

The at least one command may include a command to monitor outputs of the plurality of battery protection units and the plurality of DC/DC converters; And it may include a command to control the output of the plurality of DC/DC converters according to the monitoring results.

The processor may execute program commands stored in at least one memory. The processor may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. The memory may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory may consist of at least one of read only memory (ROM) and random access memory (RAM).

The operation of the method according to the embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner. Additionally, computer-readable recording media may include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Program instructions may include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. Some aspects of the invention may be used in the context of a device. Although described, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as a microprocessor, programmable computer, or electronic circuit, for example. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

Although the present invention has been described with reference to preferred embodiments of the present invention, those skilled in the art may modify and change the present invention in various ways without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it is possible.

200: BSC 300: EMS/PMS
400: PCS 100: BPU
150: DC/DC converter

Claims (21)

one or more first battery racks;
one or more second battery racks;
One or more DC/DC converters each controlling the second battery rack; and
Comprising a battery system control device that monitors the output of the first battery rack and the DC/DC converter in conjunction with the first battery rack and the DC/DC converter and controls the output of the DC/DC converter,
The first battery rack is not connected to the DC/DC converter, so output control according to the state of the first battery rack is impossible,
An energy storage system in which the second battery rack reinforces the performance of the first battery rack through output control of the second battery rack using the DC/DC converter. In claim 1,
The battery system control device,
Detecting the output power value of the first battery rack operating according to a charging or discharging command of the energy storage system,
An energy storage system that calculates an output power value to be output by the second battery rack using the output power value of the first battery rack, information on the first battery rack, and information on the second battery rack. In claim 2,
The information of the second battery rack is
An energy storage system comprising one or more of the number of second battery racks, state of health (SOH), state of charge (SOC), output current, output power, and temperature. In claim 2,
The battery system control device,
An energy storage system that calculates the output weight of each second battery rack using information about the second battery rack. In claim 4,
The battery system control device,
Energy configured to calculate a total power command value for the second battery rack based on the output power values of the first battery rack and the second battery rack, the quantity information of the first battery rack, and the quantity information of the second battery rack. storage system. In claim 5,
The battery system control device,
An energy storage system, configured to calculate an individual power reference value for each second battery rack based on the output weight for each second battery rack and the total power reference value for the second battery rack. In claim 1,
The battery system control device is an energy storage system that stops the output of the DC/DC converter when the output of the PCS (Power Conversion System) indicates the stop of charging and discharging operation. In claim 2,
The charging or discharging command is transmitted from the EMS (Energy Management System) of the energy storage system to the PCS. In claim 1,
The second battery rack and the DC/DC converter,
After the first battery rack is installed and operated in the energy storage system, it is additionally placed and operated in the energy storage system, Energy storage system. A battery system control device interoperating with one or more first battery racks and one or more second battery racks,
at least one processor;
Comprising a memory that stores at least one instruction to be executed through the at least one processor,
The at least one command is:
Commands to monitor the output of one or more DC/DC converters that respectively control the one or more first battery racks and the one or more second battery racks; and
Includes commands to control the output of the one or more DC/DC converters according to the monitoring results,
The first battery rack is not connected to the DC/DC converter, so the output cannot be controlled depending on the state of the battery rack,
A battery system control device in which the second battery rack and the DC/DC converter are additionally disposed in the energy storage system after the first battery rack is installed, so that the second battery rack reinforces the performance of the first battery rack. . In claim 10,
A command for monitoring the output of the one or more first battery racks and the one or more DC/DC converters is:
A battery system control device comprising a command to detect an output power value of the first battery rack operating according to a charging or discharging command of an energy storage system. In claim 10,
The command to control the output of the DC/DC converter according to the monitoring results is:
Comprising an instruction to calculate an output power value to be output by each of the one or more second battery racks using the output power value of the first battery rack, information on the first battery rack, and information on the second battery rack. , battery system control unit. In claim 10,
The command to control the output of the DC/DC converter according to the monitoring results is:
Calculate a total power command value for one or more second battery racks based on the output power values of the first battery rack and the second battery rack, the quantity information of the first battery rack, and the quantity information of the second battery rack. a command to do; and
a battery system comprising instructions to calculate an individual power reference value for each second battery rack based on the output weight for each second battery rack and the total power reference value for the one or more second battery racks. controller. In claim 11,
A battery system control device in which the charging or discharging command is transmitted from an EMS (Energy Management System) to a PCS (Power Conversion System). In claim 11,
The second battery rack and the DC/DC converter,
After the first battery rack is installed and operated in the energy storage system, it is additionally placed and operated in the energy storage system, Battery system control unit. A method of controlling an energy storage system including one or more first battery racks, one or more second battery racks, and one or more DC/DC converters each managing the one or more second battery racks,
monitoring the output of the one or more first battery racks and the one or more DC/DC converters;
detecting an output power value of the one or more first battery racks operating according to a charging or discharging command of the energy storage system;
Using the output power value of the one or more first battery racks, the information of the one or more first battery racks, and the information of the one or more second battery racks, calculating the output power value to be output by the one or more second battery racks step; and
Comprising: controlling the output of the one or more DC/DC converters according to the calculated output power value,
The one or more first battery racks are not connected to the DC/DC converter, so the output cannot be controlled according to the state of the battery rack,
The second battery rack and the one or more DC/DC converters are additionally disposed in the energy storage system after the first battery rack is installed, so that the second battery rack reinforces the performance of the first battery rack. Energy storage Control method of the system. In claim 16,
The step of calculating the output power value to be output by the one or more second battery racks,
Calculate a total power command value for one or more second battery racks based on the output power values of the first battery rack and the second battery rack, the quantity information of the first battery rack, and the quantity information of the second battery rack. steps; and
An energy storage system comprising calculating an individual power reference value for each second battery rack based on the output weight for each second battery rack and the total power reference value for the one or more second battery racks. control method. In claim 16,
Information on the one or more second battery racks,
A method of controlling an energy storage system, including one or more of the number of the one or more second battery racks, SOH, SOC, output current, output power, and temperature. In claim 16,
A method of controlling an energy storage system, further comprising stopping the output of the one or more DC/DC converters when the output of the PCS (Power Conversion System) indicates a stop of charging and discharging operation. In claim 16,
The charge or discharge command is transmitted from an EMS (Energy Management System) to a PCS. A method of controlling an energy storage system. In claim 16,
The second battery rack and the DC/DC converter,
A control method of an energy storage system, wherein the first battery rack is installed and operated within the energy storage system after the first battery rack is installed and operated within the energy storage system.

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