KR20200002224A - System and method for controlling hybrid energy storage apparatus - Google Patents

Abstract

The present invention relates to a complex energy storage device controlling system. According to an embodiment of the present invention, the complex energy storage device controlling system comprises: a first energy storage device; a second energy storage device having different characteristics from the first energy storage device; and a control unit receiving an overall set value of power to be charged or discharged to control output distribution of at least one of the first energy storage device and the second energy storage device. The first energy storage device has lower lifetime degradation than the second energy storage device, and the second energy storage device is more efficient than the first energy storage device energy.

Description

SYSTEM AND METHOD FOR CONTROLLING HYBRID ENERGY STORAGE APPARATUS}

The present invention relates to a complex energy storage device control system.

Battery-based energy storage systems (BESS) are being used in various fields of power systems for their technological maturity and excellent performance. In particular, lithium-ion battery-based ESS has been widely applied to the entire power system because of its high energy density and excellent charge / discharge efficiency.

In addition, various energy storage technologies are being researched and developed. Typical storage technologies include compressed air energy storage (CAES), flywheel, sodium sulfur (NaS) battery, and redox flow battery (RFB).

Representative disadvantages of lithium ion batteries are their lifetime and energy capacity limitations. In general, lithium-ion batteries will reach end of life after 3000-4000 cycles of operation. It is not suitable for energy capacity expansion and is mainly used for short cycles (less than 15 minutes-1 hour). In particular, when a lithium ion battery is used for power system frequency adjustment, it is limited to a reserve power that supports about ten minutes (eg, 15 minutes) in preparation for an assumed accident. The battery life is about 10 to 15 years. In order to overcome the technical limitations of the lithium ion battery, a method of fusing two or more battery technologies has been proposed, but the technology for effectively operating and controlling each battery system is insufficient.

The above-described background art is technical information possessed by the inventors for the derivation of the present invention or acquired in the derivation process of the present invention, and is not necessarily known technology disclosed to the general public before the application of the present invention.

Japanese Laid-Open Patent Publication No. 2001-00268814

In order to solve the above problems and / or limitations, the output of each energy storage device according to the charge and discharge size or operation point by complementing the advantages and disadvantages of the combined energy storage device combining two or more energy storage devices. The purpose of the present invention is to effectively control and distribute the control system, thereby extending the life of the complex energy storage control system and improving the efficiency thereof.

In one embodiment, a combined energy storage device control system includes a first energy storage device; A second energy storage device different from the first energy storage device; And a controller configured to control the output distribution of one or more of the first energy storage device and the second energy storage device by receiving a total set value of electric power to be charged or discharged, wherein the first energy storage device includes the second energy storage device. The lifetime deterioration is less than that of the energy storage device, and the second energy storage device may be more efficient than the energy of the first energy storage device.

The controller may be configured to stop the operation of the first energy storage device and to operate the second energy storage device to generate an output when the total set value of the power is less than or equal to the minimum operating output value of the first energy storage device. can do.

The control unit may be further configured to, when the total set value of the power exceeds the minimum operating output value of the first energy storage device, and the total set value of the power exceeds the maximum output that the first energy storage device can generate. The first energy storage device may be operated to generate a maximum output value, and the entire set value of the remaining power may be controlled to generate an output by operating the second energy storage device.

The controller may be configured such that when the total set value of the power exceeds a minimum operating output value of the first energy storage device and the total set value of the power is equal to or less than a maximum output that the first energy storage device can generate, The operation of the energy storage device may be stopped and the first energy storage device may be operated to generate an output.

The controller may include a first calculator configured to differentially calculate a first signal and a second signal; A low pass filter for low pass filtering the operation result of the first calculator; A first signal switch configured to select a first terminal or a second terminal by a third signal to output a low pass filtering signal of the low pass filter or the first signal; A second calculator for differentially calculating the lowpass filtering signal of the lowpass filter to the sum of the second signal and the first calculator output signal; And a second signal switching unit configured to select a first terminal or a second terminal by the third signal to output an output signal of the second calculator or the set signal.

The first signal includes an overall set value of the power, the second signal includes an output initial setting value of the first energy storage device, and the third signal is a value of whether the first energy storage device is applied or not. It may include a value indicating.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to embodiments, the shortcomings of the respective energy storage devices may be compensated for to extend the overall life of the complex energy storage control system and to improve efficiency.

In addition, the energy capacity of the complex energy storage control system can be extended and the system contribution can be improved.

In addition, the construction cost of the complex energy storage device control system can be reduced.

In addition, due to technical limitations such as large capacity, it is possible to expand the business areas that have been applied under control.

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

1 is a view illustrating schematically a complex energy storage device control system according to an embodiment of the present invention.
FIG. 2 is a flowchart for describing a method of operating a local controller according to an exemplary embodiment of the system of FIG. 1.
3 is a flowchart illustrating a method of operating a local controller according to another exemplary embodiment of the system of FIG. 1.
4 is a detailed block diagram of a local controller according to another embodiment of the system of FIG. 1.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments set forth below, but may be embodied in many different forms and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. . The embodiments set forth below are provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, the same or corresponding components will be given the same reference numerals and redundant description thereof will be omitted. Let's do it.

1 is a view illustrating schematically a complex energy storage device control system according to an embodiment of the present invention. Referring to FIG. 1, the combined energy storage device control system 1 includes a first energy storage device 110, a second energy storage device 120, a first DC / DC converter 130, and a second DC / DC converter. 140, DC / AC inverter 150, master controller 160, and local controller 170.

In the combined energy storage device control system 1, each of the first energy storage device 110 and the second energy storage device 120 has its own advantages and disadvantages. In the present embodiment, the first energy storage device 110 may include a redox flow battery, and the second energy storage device 120 may include a lithium ion battery. The complex energy storage control system 1 may improve performance using fusion control techniques for the first energy storage 110 and the second energy storage 120. The characteristics of the first energy storage device 110 and the second energy storage device 120 are shown in Table 1 below.

Applied Technology Characteristic First energy storage device 110
(Redox flow battery) 밀도 energy density, 低 energy efficiency at load
Excellent service life: 20,000 cycles
Easy to mass storage
Low cost Second energy storage device 120
(Lithium ion battery) High energy density, high energy efficiency
Life limit: 3,000 to 4,000 cycles
Storage limit: up to 4MW
High cost

Currently, the energy storage device used in the power system is constructed by the second energy storage device 120 alone. In order to overcome the high cost, short life cycle, and capacity limitation, which are pointed out as the disadvantages of the second energy storage device 120, it may be operated together with the first energy storage device 110. In order to maximize the advantages of the first energy storage device 110 and the second energy storage device 120, and to compensate for the shortcomings, the control to effectively adjust and distribute the output of each energy storage device according to the charge and discharge size or operation point. The system needs to be built. Accordingly, in the present embodiment, it is possible to provide the complex energy storage device control system 1 capable of improving performance according to the magnitude of the charge / discharge required value. In the high output state, the output ratio of the first energy storage device 110 having a short lifespan may be increased, and in the low output state, the output ratio may be adjusted to increase the output specific gravity of the second energy storage device 120 having excellent efficiency. By distributing the output specific gravity in consideration of the characteristics of the energy storage device at each operating point, it is possible to maximize the performance of the combined energy storage control system 1 as a whole.

The first energy storage device 110 and the first DC / DC converter 130 may receive the output set value P_VRB_set (t) from the local controller 170. If the output set value P_VRB_set (t) of the first energy storage device 110 is a discharge command value, the power charged in the first energy storage device 110 is converted into the first DC / DC converter 130 and the DC / AC. The inverter 150 may be supplied to the outside (eg, a grid). However, when the output set value P_VRB_set (t) of the first energy storage device 110 is the charge command value, external power is supplied to the first energy through the DC / AC inverter 150 and the first DC / DC converter 130. The storage device 110 may be charged.

Here, the first DC / DC converter 130 is a power converter, and may be a bidirectional converter in which the directions of the input and the output may be changed. The first DC / DC converter 130 may DC-DC convert the power stored in the first energy storage device 110 into a DC voltage required by the DC / AC inverter 150 by a discharge command and output the DC-DC converter. The first DC / DC converter 130 may convert the voltage of the power output from the DC / AC inverter 150 by the charging command into a charging voltage capable of charging the first energy storage device 110. have. The first DC / DC converter 130 may stop the operation when the first energy storage device 110 does not need to be charged or discharged to minimize power consumption.

In addition, the DC / AC inverter 150 may convert a DC voltage output from the first energy storage device 110 into an AC voltage by the discharge command and output the converted AC voltage. In addition, the DC / AC inverter 150 rectifies and converts an AC voltage received from the outside into a DC voltage in order to store power from the outside in the first energy storage device 110 by a charging command ( Not shown). The DC / AC inverter 150 may be a bidirectional inverter in which directions of input and output may be changed.

The DC / AC inverter 150 may include a filter (not shown) to remove harmonics from the AC voltage output to the outside. In addition, the DC / AC inverter 150 includes a phase locked loop (PLL) circuit for synchronizing the phase of the AC voltage output from the DC / AC inverter 150 and the phase of the external AC voltage to suppress generation of reactive power. It may include. In addition, the DC / AC inverter 150 may perform functions such as voltage fluctuation range limitation, power factor improvement, DC component removal, and transient phenomena protection. The DC / AC inverter 150 may stop operation to minimize power consumption when not in use.

The second energy storage device 120 and the second DC / DC converter 140 may receive the output set value P_LIB_set (t) of the second energy storage device 120 from the local controller 170. If the output set value P_LIB_set (t) of the second energy storage device 120 is the discharge command value, the power charged in the second energy storage device 120 is converted into the second DC / DC converter 140 and DC / AC. The inverter 150 may be supplied to the outside (eg, a grid). However, when the output set value P_LIB_set (t) of the second energy storage device 120 is the charge command value, the external power is supplied to the second energy through the DC / AC inverter 150 and the second DC / DC converter 140. The storage device 120 may be charged.

Here, the second DC / DC converter 140 is a power converter, and may be a bidirectional converter in which the directions of the input and the output may be changed. The second DC / DC converter 140 may DC-DC convert the power stored in the second energy storage device 120 into a DC voltage required by the DC / AC inverter 150 by a discharge command and output the DC-DC converter. The second DC / DC converter 140 may convert the voltage of the power output from the DC / AC inverter 150 by the charging command into a charging voltage capable of charging the second energy storage device 120. have. The second DC / DC converter 140 may stop the operation when the second energy storage device 120 does not need to be charged or discharged to minimize power consumption.

In addition, the DC / AC inverter 150 may convert a DC voltage output from the second energy storage device 120 into an AC voltage by the discharge command and output the converted AC voltage. In addition, the DC / AC inverter 150 rectifies and converts an AC voltage received from the outside into a DC voltage in order to store power from the outside in the second energy storage device 120 by a charging command ( Not shown). The DC / AC inverter 150 may be a bidirectional inverter in which directions of input and output may be changed.

The master controller 160 is supplied and / or supplied by the first energy storage device 110 and / or the second energy storage device 120 according to the operation mode, state, and external input / output values of the entire complex energy storage device control system 1. Alternatively, the total set value P_set (t) of power to be absorbed may be calculated for each sampling time. The entire set value P_set (t) of the calculated power may be transmitted to the local controller 170. The local controller 170 receives the total set value P_set (t) of power from the master controller 160 to distribute the output set values of the first energy storage device 110 and the second energy storage device 120. Can be. The output setting value of the first energy storage device 110 calculated by the local controller 170 may include P_VRB_set (t), and the output setting value of the second energy storage device 120 may include P_LIB_set (t). can do. The sum of the two output set values may be equal to the total set value P_set (t) of power (P_set (t) = P_VRB_set (t) + P_LIB_set (t)).

2 is a flowchart illustrating a method of operating a local controller in the system of FIG. 1. In the following description, portions that overlap with the description of FIG. 1 will be omitted. The local controller 170 receives the charging and / or discharging setting values of the first energy storage device 110 and / or the second energy storage device 120 from the master controller 160 to increase the advantages of the individual energy storage device. It can serve to distribute the size of individual energy storage outputs. The basic operating concept of the individual controllers of the local controller 170 is to use the first energy storage unit 110 having a long life at high loads, and to use the second energy storage unit 120 having high efficiency at low loads. will be. In order to operate the local controller 170, a minimum operation output value P_VRB_op_min of the first energy storage device 110 capable of operating the first energy storage device 110 must be specified.

Referring to FIG. 2, in step S210, the local controller 170 receives the total set value P_set (t) of power from the master controller 160.

In operation S220, the local controller 170 compares the total set value P_set (t) of the received power with the minimum operation output value P_VRB_op_min of the first energy storage device 110 to determine the total set value of the received power. It is determined whether (P_set (t)) exceeds the minimum operation output value P_VRB_op_min of the first energy storage device 110 (| P_set (t) |> | P_VRB_op_min |). Here, when the output value of the first energy storage device 110 is smaller than the minimum operation output value P_VRB_op_min, the efficiency may be regarded as having no operational advantage.

In operation S230, when the total set value P_set (t) of the received power is less than or equal to the minimum operation output value P_VRB_op_min of the first energy storage device 110, the local controller 170 may determine the first energy storage device 110. The second energy storage device 120 is stopped and the second energy storage device 120 is operated to control the second energy storage device 120 to output an output corresponding to the total set value P_set (t) of power (P_VRB_set (t). ) = 0, P_LIB_set (t) = P_set (t)).

In operation S240, when the total set value P_set (t) of the received power exceeds the minimum operation output value P_VRB_op_min of the first energy storage device 110, the local controller 170 may set the total set value P_set of power. It is determined whether (t)) exceeds the maximum operating output value P_VRB_max of the first energy storage device 110 (| P_set (t) |> | P_VRB_max |).

In operation S250, when the total set value P_set (t) of the power exceeds the maximum operating output value P_VRB_max of the first energy storage device 110, the local controller 170 may determine the first energy storage device 110. And the second energy storage device 120 is all operated, and the first energy storage device 110 is controlled to generate the maximum operation output value P_VRB_max, and the rest of the total set value P_set (t) of the power is set to the second. 2 The energy storage device 120 controls to generate an output (P_VRB_set (t) = P_VRB_max, P_LIB_set (t) = P_set (t)-P_VRB_max).

In operation S260, when the total set value P_set (t) of the electric power is less than or equal to the maximum operating output value P_VRB_max of the first energy storage device 110, the local controller 170 operates the second energy storage device 120. The first energy storage device 110 is operated to control the first energy storage device 110 to output an output corresponding to the total set value P_set (t) of electric power by operating the first energy storage device 110 (P_VRB_set (t) =). P_set (t), P_LIB_set (t) = 0).

3 is a flowchart for describing a method of operating a local controller according to another exemplary embodiment of the system of FIG. 1. In the following description, portions overlapping with the description of FIGS. 1 and 2 will be omitted. The present embodiment may include a method of calculating an output initial setting value of the first energy storage device 110 to describe another embodiment of the local controller 170 illustrated in FIG. 4. This is to solve the problem of shortening of life due to frequent switching of the charge / discharge state of the second energy storage device 120 that receives the unstable charge / discharge command from the local controller 170.

Referring to FIG. 3, in step S310, the local controller 170 receives a total set value P_set (t) of power from the master controller 160.

In operation S320, the local controller 170 compares the total set value P_set (t) of the received power with the minimum operation output value P_VRB_op_min of the first energy storage device 110 to determine the total set value of the received power. It is determined whether (P_set (t)) exceeds the minimum operating output value P_VRB_op_min of the first energy storage device 110 (| P_set (t) |> | P_VRB_op_min |), and the total set value of power P_set (t )) Is greater than the minimum operating output value P_VRB_op_min of the first energy storage device 110, and generates a first value (for example, 1) in the VRB_ON signal, and the total set value of power P_set (t) is If less than the minimum operation output value P_VRB_op_min of the first energy storage device 110, a second value (eg, 0) is generated in the VRB_ON signal.

Here, the VRB_ON signal refers to the first energy storage device 110 that determines whether the total set value P_set (t) of power exceeds the minimum operation output value P_VRB_op_min of the first energy storage device 110. If the VRB_ON signal is a first value, it may include that the output initial setting value P_VRB_set1 (t) of the first energy storage device 110 exists by applying the first energy storage device 110 when the VRB_ON signal is the first value. If the VRB_ON signal is the second value, the first energy storage device 110 may not be applied, and thus the output initial setting value P_VRB_set1 (t) of the first energy storage device 110 may not exist.

In operation S330, when the total set value P_set (t) of the power is less than or equal to the minimum operation output value P_VRB_op_min of the first energy storage device 110, the local controller 170 may add a second value (eg, to the VRB_ON signal). 0), and the output initial setting value P_VRB_set1 (t) of the first energy storage device 110 is set to zero.

In operation S340, when the total set value P_set (t) of the power exceeds the minimum operation output value P_VRB_op_min of the first energy storage device 110, the local controller 170 may add a first value (eg, to the VRB_ON signal). For example, whether 1) is generated and the total set value P_set (t) of the power received from the master controller 160 exceeds the maximum operating output value P_VRB_max of the first energy storage device 110 (| P_set ( t) |> | P_VRB_max |)

In operation S350, when the total set value P_set (t) of the power exceeds the maximum operating output value P_VRB_max of the first energy storage device 110, the local controller 170 may operate in the first energy storage device 110. The output initial set value P_VRB_set1 (t) is set to the maximum operation output value P_VRB_max of the first energy storage device 110 (P_VRB_set1 (t) = P_VRB_max).

In operation S360, the local controller 170 may initialize the output of the first energy storage device 110 when the total set value P_set (t) of the power is equal to or less than the maximum operating output value P_VRB_max of the first energy storage device 110. The set value P_VRB_set1 (t) is set to the total set value P_set (t) of power.

4 is a detailed block diagram of a local controller according to another embodiment of the system of FIG. 1. In the following description, portions overlapping with the description of FIGS. 1 to 3 will be omitted. Referring to FIG. 4, the local controller 170 may include a first calculator 171, a low pass filter 172, a first signal switch 173, a second calculator 174, and a second signal switch 175. It may include.

In the present embodiment, for convenience of description, the first signal may include the total set value P_set (t) of power received from the master controller 160, and the second signal may store the first energy stored in FIG. 4. The output initial setting value P_VRB_set1 (t) of the device 110 may be included, and the third signal may include a value of whether the first energy storage device is applied (VRB_ON). In addition, the signal output from the first signal switch 173 may be transmitted to the first DC / DC converter 130 as the output distribution signal P_VRB_set2 (t) of the first energy storage device 110, and the second signal may be transmitted to the first DC / DC converter 130. The signal output from the signal switching unit 175 may be transmitted to the second DC / DC converter 140 as the output distribution signal P_LIB_set (t) of the second energy storage device 120.

The first calculator 171 may differentially calculate the first signal and the second signal. The low pass filter 172 may low pass filter the operation result of the first calculator 171 into a predetermined band. The first signal switching unit 173 may select the first terminal or the second terminal by the third signal to output the low pass filtering signal of the low pass filter 172 or to output the first signal. The second calculator 174 may differentially calculate the lowpass filtering signal of the lowpass filter 172 to the sum of the second signal and the output signal of the first calculator 171. The second signal switching unit 175 may select the first terminal or the second terminal by the third signal, and output the output signal or the set signal of the second calculator 174.

When the third signal is a second value (for example, 0), the second signal becomes 0 (see FIG. 3), and the first signal switching unit 173 outputs the first signal and switches the second signal. The unit 175 may output a set value, for example, zero. When the third signal is the first value (eg, 1), the second signal is the maximum operating output value P_VRB_max of the first energy storage device 110 or the first signal, that is, the overall set value P_set ( t)).

First, when the third signal is a first value (for example, 1) and the second signal is the maximum operation output value P_VRB_max of the first energy storage device 110, the first calculator 171 will be described. P_set (t) -P_VRB_max is output, and the low pass filter 172 low-pass filters P_set (t)-P_VRB_max. Herein, when the first signal, that is, the entire set value P_set (t) of the power is unstable, the output of the first calculator 171 is also unstable, so that the second energy storage device 120 that receives the unstable charge / discharge command frequently receives charging. Life cycle can be shortened due to switching of discharge state. Therefore, the output of the first operation unit 171 can be converted into a stable state by low-pass filtering. The first signal switch 173 selects the output of the low pass filter 172 based on the first value (for example, 1) (low pass filtered P_set (t) -P_VRB_max) to convert the second DC / DC converter ( 140). The second calculating unit 174 sums the maximum operating output value P_VRB_max of the first energy storage device 110 and the output P_set (t) -P_VRB_max of the first calculating unit 171, and calculates the low pass filter 172. P_VRB_max is subtracted from the output (low pass filtered P_set (t) -P_VRB_max). The second signal switching unit 175 may select (P_VRB_max) the output of the second calculator 174 based on the first value (for example, 1) and output the same to the first DC / DC converter 130. This may be the same as the situation where the unstable signal is removed in step 250 of FIG. 2.

Next, a case where the third signal is the first value (for example, 1) and the second signal is the first signal, that is, the total set value P_set (t) of power, will be described. ) Outputs P_set (t) -P_set (t) = 0, so the first signal switching unit 173 outputs 0. That is, it can be seen that the second energy storage device 120 does not operate. The second calculating unit 174 sums the first signal, that is, the total set value P_set (t) of power and the output 0 of the first calculating unit 171, and outputs the low pass filter 172 (0). , The second signal switching unit 175 may select (P_set (t)) the output of the operation unit 174 and output the same to the second DC / DC converter 140. This may be the same as the situation where the unstable signal is removed in step 260 of FIG. 2.

As such, the shortcomings of the first energy storage device 110 and the second energy storage device 120 may be compensated for each other, thereby extending the lifespan of the entire complex energy storage device control system 1 and improving efficiency. The low efficiency at low load, which has been pointed out as a disadvantage of the first energy storage device 110, and the life limitation, which is a disadvantage of the second energy storage device 120, is complemented by a control algorithm to provide a high efficiency and long life energy storage technology. Can develop.

In addition, the energy capacity of the complex energy storage control system 1 can be expanded and the system contribution can be improved. In the domestic power system, the energy storage technology centered on the second energy storage device 120 is used, and the second energy storage device 120 has a difficulty in expanding the energy capacity (Wh) after installation. In particular, the second energy storage device 120, which is used for frequency adjustment, only supplies energy for 15 minutes at the rated output. In the case of the first energy storage device 110, only the electrolyte may be added to easily expand the energy capacity. Therefore, it is possible to improve the system stabilization contribution by increasing the energy capacity supplied to the system.

In addition, the construction cost of the complex energy storage control system 1 can be reduced. The cost of selling the second energy storage device 120 is increasing, but lithium metal is expensive and there is a limit in reducing the introduction cost due to the limited amount of reserves. Therefore, it is possible to build a system that generates a unified output by integrating with the first energy storage device 110, which is relatively inexpensive to build.

In addition, due to technical limitations such as large capacity, it is possible to expand the business areas that have been applied under control.

Embodiments according to the present invention described above may be implemented in the form of a computer program that can be executed through various components on a computer, such a computer program may be recorded in a computer-readable medium. At this time, the media may be magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and ROMs. Hardware devices specifically configured to store and execute program instructions, such as memory, RAM, flash memory, and the like.

On the other hand, the computer program may be specially designed and configured for the present invention, or may be known and available to those skilled in the computer software field. Examples of computer programs may include not only machine code generated by a compiler, but also high-level language code executable by a computer using an interpreter or the like.

In the specification (particularly in the claims) of the present invention, the use of the term “above” and the similar indicating term may be used in the singular and the plural. In addition, in the present invention, when the range is described, it includes the invention to which the individual values belonging to the range are applied (if there is no description thereof), and each individual value constituting the range is described in the detailed description of the invention. Same as

If the steps constituting the method according to the invention are not explicitly stated or contrary to the steps, the steps may be performed in a suitable order. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary terms (eg, etc.) in the present invention is merely for the purpose of describing the present invention in detail, and the scope of the present invention is limited by the above examples or exemplary terms unless defined by the claims. It doesn't happen. In addition, one of ordinary skill in the art appreciates that various modifications, combinations and changes can be made depending on design conditions and factors within the scope of the appended claims or equivalents thereof.

Therefore, the spirit of the present invention should not be limited to the above-described embodiment, and all the scope equivalent to or equivalent to the scope of the claims as well as the claims to be described below are within the scope of the spirit of the present invention. Will belong to.

110: first energy storage device
120: second energy storage device
130: first DC / DC converter
140: second DC / DC converter
150: DC / AC inverter
160: master controller
170: local controller

Claims (6)

A first energy storage device;
A second energy storage device different from the first energy storage device;
And a controller configured to control the output distribution of at least one of the first energy storage device and the second energy storage device by receiving a total set value of power to be charged or discharged.
Wherein said first energy storage device has a less lifetime degradation than said second energy storage device, and said second energy storage device is more efficient than said first energy storage device energy. The method of claim 1, wherein the control unit,
If the total set value of the electric power is equal to or less than the minimum operating output value of the first energy storage device, the operation of the first energy storage device is stopped, and the second energy storage device is operated so as to generate an output. Storage control system. The method of claim 1, wherein the control unit,
The first energy storage when the total set value of the power exceeds the minimum operating output value of the first energy storage device and the total set value of the power exceeds the maximum output that the first energy storage device can generate. Operating the device to generate a maximum output value, and wherein the overall set value of the remaining power controls the second energy storage device to generate an output. The method of claim 1, wherein the control unit,
When the total set value of the power exceeds the minimum operating output value of the first energy storage device and the total set value of the power is less than or equal to the maximum output that the first energy storage device can generate, Stopping the operation and controlling the first energy storage device to generate an output. The method of claim 1, wherein the control unit,
A first calculator configured to differentially calculate the first signal and the second signal;
A low pass filter for low pass filtering the operation result of the first calculator;
A first signal switch configured to select a first terminal or a second terminal by a third signal to output a low pass filtering signal of the low pass filter or the first signal;
A second calculator for differentially calculating the lowpass filtering signal of the lowpass filter to the sum of the second signal and the first calculator output signal; And
And a second signal switching unit configured to select a first terminal or a second terminal by the third signal to output an output signal of the second calculator or the set signal. The method of claim 5,
The first signal includes an overall set value of the power, the second signal includes an output initial setting value of the first energy storage device, and the third signal is a value of whether the first energy storage device is applied or not. And a value indicative of the value.

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