Power distribution system for resolving power imbalance in power network where alternating current power network and direct current power network are mixed, and method thereof

Abstract

The present invention relates to a power distribution system and method for resolving power imbalance in a hybrid power distribution system where an alternating current (AC) power network and a direct current (DC) power network are mixed. The power distribution system according to an embodiment of the present invention includes a power distribution device which connects a first DC power network to a second DC power network to a n-th DC power network, and an energy control device which controls power sharing with other DC power networks when the power shortage of the first DC power network occurs. Through this, it is possible to minimize the burden on the AC power grid by optimizing power sharing among DC microgrids and improve the stability and efficiency of the power system.

Description

Distribution system and method for resolving power imbalance in a mixed AC and DC power grid

[0001] The present invention relates to a power distribution system and a power distribution method, and more particularly to a power distribution system and a method for resolving power imbalance in a hybrid power distribution system in which an alternating current (AC) power grid and a direct current (DC) power grid are mixed.

[0002]

[0003] Power systems have long operated based on alternating current (AC). However, with the recent increase in DC-based power facilities, such as renewable energy sources and energy storage devices, AC-DC hybrid distribution systems are gaining attention. These systems incorporate both AC and DC microgrids and offer the advantage of increasing energy efficiency and improving power quality by minimizing conversion between DC and AC.

[0004] However, AC-DC mixed distribution systems have the potential for power imbalance due to the complex interactions between AC and DC microgrids, which can affect the overall stability of the system. Conventional distribution systems, primarily composed of AC systems and a single DC microgrid, have struggled to effectively address power imbalance issues arising in environments with multiple DC microgrids.

[0005] In particular, AC systems connected to a single DC microgrid are sensitive to fluctuations in renewable energy generation or load variations within the microgrid, which can lead to AC system overload or power quality degradation. Furthermore, in the event of a fault in the AC system, it is difficult to maintain a stable power supply using only a single DC microgrid.

[0006] The increasing number of renewable energy sources and distributed power sources presents new challenges to the stable operation of power systems. Renewable energy sources such as solar and wind power generate fluctuating amounts depending on weather conditions, which can lead to instability in the power grid. While battery energy storage systems are widely used to compensate for this, their limited storage capacity makes it difficult to perfectly compensate for all power fluctuations. Furthermore, as distributed power sources increase, power flow becomes more complex, making efficient management difficult using existing centralized grid operation methods. Therefore, new distribution systems and operational methods are required to effectively integrate DC-based grids—such as renewable and distributed power sources—with traditional AC grids and to ensure stable operation.

[0007]

[0008] The present invention aims to provide a new power distribution system and operation method capable of effectively integrating and stably operating a DC-based power grid, such as renewable energy sources and distributed power sources, with a traditional AC power grid.

[0009]

[0010] According to one embodiment of the present invention, a power distribution system is disclosed comprising: a power distribution device connecting a first DC power network and a second DC power network to an nth DC power network; and an energy control device that resolves the power shortage of the first DC power network by controlling the power distribution device when a power shortage occurs in the first DC power network and sharing power from one or more of the second DC power network to the nth DC power network with the first DC power network, wherein the first DC power network is connected to an AC power network and n is a natural number greater than or equal to 2.

[0011] According to an embodiment, the energy control device of the power distribution system can calculate the amount of power shortage by using the difference between the load power of the first DC power network and the supply power of the first DC power network.

[0012] According to an embodiment, if the energy control device of the power distribution system determines, based on the result of calculating the insufficient power amount, that the power of the first DC power network is insufficient, it can control the power distribution device so that at least one of the powers from the second DC power network to the nth DC power network is supplied to the first DC power network.

[0013] According to an embodiment, the energy control device of the power distribution system can control the power distribution device by determining the supplyable power amount of each of the second DC power grid to the nth DC power grid.

[0014] According to an embodiment, the energy control device of the power distribution system controls the power distribution device using the result of comparing the power deficit amount and the power supplyable amount, wherein the power deficit amount is calculated by Equation 1 and the power supplyable amount can be calculated by Equation 2.

[0015] [Mathematical Formula 1]

[0016] Psharing = Psupply - PLoad

[0017] However, the above Psharing is the above power shortage, the above Psupply is the supply power of the above first DC power grid, and the above PLoad is the load power of the above first DC power grid.

[0018] [Mathematical Formula 2]

[0019]

[0020] However, the above PBESS_T is the supplyable power amount, and the above PBESS_i is the supplyable power of each of the second DC power grid to the nth DC power grid.

[0021] According to an embodiment, if the magnitude of the power shortage amount is less than the magnitude of the power supply amount, the energy control device of the power distribution system can control the power distribution device using the state of charge (SOC) of each of the second DC power network to the nth DC power network.

[0022] According to an embodiment, if the magnitude of the power shortage is greater than or equal to the magnitude of the power supplyable amount, the energy control device of the power distribution system can control the power distribution device so that the entire power supplyable amount is supplied to the first DC power grid.

[0023] According to an embodiment, the energy control device of the power distribution system can control the power of the AC power grid to be supplied to the first DC power grid when the magnitude of the power deficit is greater than or equal to the magnitude of the power supplyable.

[0024] According to an embodiment, the energy control device of the power distribution system can control the power supply to the first DC power grid of the AC power grid to be interrupted when the magnitude of the power shortage amount is less than the magnitude of the power supplyable amount.

[0025] According to an embodiment, the power distribution device of the power distribution system may include n-1 DC distribution panels (DCSOP) that respectively connect the first DC power grid and the second DC power grid to the nth DC power grid.

[0026] According to an embodiment, the n-1 DC switchboards (DCSOPs) may include semiconductor switching elements that are individually controlled by the energy control device.

[0027]

[0028] According to another embodiment of the present invention, a power distribution method is disclosed in a power distribution system comprising a first DC power network connected to an AC power network, and second to nth DC power networks connected to the first DC power network through a power distribution device, wherein the method comprises: a step of determining whether a power shortage occurs in the first DC power network; and a step of, when a power shortage occurs, controlling the power distribution device to share power from one or more of the second to nth DC power networks with the first DC power network to resolve the power shortage in the first DC power network.

[0029] According to an embodiment, the step of determining whether a power shortage has occurred may include a step of calculating the amount of power shortage using the difference between the load power of the first DC power network and the supply power of the first DC power network.

[0030] According to an embodiment, the step of resolving the power shortage may include the step of controlling the power distribution device so that if it is determined that the power of the first DC power network is insufficient based on the result of calculating the power shortage amount, at least one of the powers from the second DC power network to the nth DC power network is supplied to the first DC power network.

[0031] According to an embodiment, the step of controlling the power distribution device may include determining the supplyable power amount of each of the second DC power network to the nth DC power network and controlling the power distribution device.

[0032] According to an embodiment, the step of controlling the power distribution device includes the step of controlling the power distribution device using the result of comparing the power deficit amount and the power supplyable amount, wherein the power deficit amount is calculated by Equation 1 and the power supplyable amount can be calculated by Equation 2.

[0033] [Mathematical Formula 1]

[0034] Psharing = Psupply - PLoad

[0035] However, the above Psharing is the above power shortage, the above Psupply is the supply power of the above first DC power grid, and the above PLoad is the load power of the above first DC power grid.

[0036] [Mathematical Formula 2]

[0037]

[0038] However, PBESS_T is the supplyable power amount, and PBESS_i is the second DC power grid (150-2) to

[0039] Each of the nth DC power grids (150-n) can be a supplyable power.

[0040] According to an embodiment, the step of controlling the power distribution device may include controlling the power distribution device using the state of charge (SOC) of each of the second DC power network to the nth DC power network when the magnitude of the deficit power amount is less than the magnitude of the supplyable power amount.

[0041] According to an embodiment, the step of controlling the power distribution device may include the step of controlling the power distribution device such that if the magnitude of the power shortage is greater than or equal to the magnitude of the power supplyable amount, the entire power supplyable amount is supplied to the first DC power grid.

[0042] According to an embodiment, the step of resolving the power shortage may further include a step of controlling the power of the AC power grid to be supplied to the first DC power grid when the magnitude of the power shortage is greater than or equal to the magnitude of the power available for supply.

[0043] According to an embodiment, the step of resolving the power shortage may further include the step of stopping the power supply of the AC power grid to the first DC power grid when the magnitude of the power shortage amount becomes less than the magnitude of the power supplyable amount.

[0044] According to an embodiment, the step of resolving the power shortage may include individually controlling n-1 DC distribution panels (DCSOPs) that respectively connect the first DC power grid and the second DC power grid to the nth DC power grid, and sharing power from one or more of the second DC power grid to the nth DC power grid to the first DC power grid.

[0045]

[0046] According to the present invention, a new power distribution system and operation method can be provided that can effectively integrate a DC-based power grid and a traditional AC power grid and operate them stably.

[0047]

[0048] A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of the invention.

[0049] FIG. 1 is a block diagram of a power distribution system according to one embodiment of the present invention.

[0050] FIG. 2 is a diagram showing the operation flow of a power distribution system according to one embodiment of the present invention.

[0051] FIG. 3 is a block diagram of a power distribution device according to one embodiment of the present invention.

[0052] FIG. 4 is a flowchart of a power distribution method according to another embodiment of the present invention.

[0053]

[0054] The technical concept of the present disclosure is subject to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the technical concept of the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the scope of the technical concept of the present disclosure.

[0055] In describing the technical concept of the present disclosure, detailed descriptions of related prior art are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the technical concept of the present disclosure. Furthermore, numbers used in the description of the present invention (e.g., First, Second, etc.) are merely identification symbols to distinguish one component from another.

[0056] In addition, when a component is described in this document as being "connected" or "joined" with another component, it should be understood that the component may be directly connected or joined to the other component, but unless otherwise specifically stated, it may also be connected or joined through another component in between.

[0057] Additionally, terms such as “~part,” “~device,” and “~part” described herein refer to a unit that processes at least one function or operation, and this may be implemented as hardware such as a processor, microprocessor, microcontroller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), software, or a combination of hardware and software.

[0058] Furthermore, it is intended to clarify that the classification of the components in this document is merely based on the primary function each component is responsible for. That is, two or more components described below may be combined into a single component, or a single component may be divided into two or more components based on more subdivided functions. Additionally, each component described below may additionally perform some or all of the functions of other components in addition to its own primary function, and it goes without saying that some of the primary functions of each component may be exclusively performed by other components.

[0059] Hereinafter, various embodiments according to the technical concept of the present disclosure will be described in detail in turn.

[0060]

[0061] FIG. 1 is a block diagram of a power distribution system according to one embodiment of the present invention.

[0062] Referring to FIG. 1, a power distribution system (100) according to one embodiment of the present invention may include an AC power grid (110), a first DC power grid (150-1), a second DC power grid (150-2) to an nth DC power grid (150-n), a first DC distribution panel (160-1), a second DC distribution panel (160-2) to an n-1 DC distribution panel (160-(n-1)), an energy control device (130), and a communication network (140).

[0063] The alternating current power grid (110) may be a utility grid and may be connected to the first direct current power grid (150-1). For example, the alternating current power grid (110) may be connected to the first direct current power grid (150-1) as a system that transmits and distributes electricity produced at a power plant to a wide area through transmission lines.

[0064] The first DC power grid (150-1) to the nth DC power grid (150-n) (where n is a natural number greater than or equal to 2) may be a renewable energy power grid. For example, each of the first DC power grid (150-1) to the nth DC power grid (150-n) may be one or more of the renewable energy power grids such as a solar energy power grid, a wind energy power grid, a hydroelectric energy power grid, a geothermal energy power grid, etc.

[0065] In particular, the first DC power grid (150-1) can be individually connected to the second DC power grid (150-2) to the nth DC power grid (150-n) through power distribution devices (160-1 to 160-(n-1)). Referring to FIG. 1, the first DC power grid (150-1) can be connected to the second DC power grid (150-2) through the first DC distribution panel (160-1). Additionally, the first DC power grid (150-1) can be connected to the third DC power grid (150-3) through the second DC distribution panel (160-2). Additionally, the first DC power grid (150-1) can be connected to the nth DC power grid (150-n) through the n-1 DC distribution panel (160-(n-1)).

[0066] The power distribution device may be a concept comprising (n-1) DC distribution panels (DCSOPs) from the first DC distribution panel (160-1) to the n-1 DC distribution panel (160-(n-1)) (hereinafter collectively referred to as 160). The (n-1) DC distribution panels (160-1 to 160-(n-1)) may be devices that distribute DC-based power, such as DC SOPs (DC Soft Open Points). As described above, the (n-1) DC distribution panels (160-1 to 160-(n-1)) may each be connected to a corresponding DC power grid.

[0067] The energy control device (130) can control the DC network (120) by being connected to the power distribution device (160) through the communication network (140). Here, the DC network (120) is a name given for convenience of understanding and explanation, and may be a concept including a power distribution device including (n-1) DC distribution panels (160-1 to 160-(n-1)) and n DC power networks (150-2 to 150-n). When a power shortage occurs in the first DC power network (150-1), the energy control device (130) can resolve the power shortage in the first DC power network (150-1) by controlling the power distribution device (160-1 to 160-(n-1)) and using power from other DC power networks (150-2 to 150-n). At this time, the energy control device (130) can control each DC distribution panel (160-1 to 160-(n-1)) individually to adjust the power supply amount of each DC power grid (150-2 to 150-n).

[0068] The communication network (140) may be of various forms, such as the Internet or a mobile communication network. The communication network (140) may be applied regardless of its type as long as it is a communication network capable of transmitting and receiving data between the energy control device (130) and the DC network (120).

[0069] The connection structure and operation between the energy control device (130) and the DC network (120) will be explained in detail below with reference to FIG. 2.

[0070]

[0071] FIG. 2 is a diagram showing the operation flow of a power distribution system according to one embodiment of the present invention.

[0072] Referring to FIG. 2, information flow between an energy control device (130), a first DC distribution panel (160-1), a second DC distribution panel (160-2), a first DC power grid (150-1), a second DC power grid (150-2), and a third DC power grid (150-3) according to one embodiment of the present invention is illustrated. That is, FIG. 2 illustrates a distribution system (100) in the case where n is 3.

[0073] The energy control device (130) can receive power information from the first DC power grid (150-1), the second DC power grid (150-2), and the third DC power grid (150-3). The power information may include information on the amount of power that each DC power grid (150-1, 150-2, 150-3) can supply, for example, information on the State of Charge (SOC) of the battery storage device within each DC power grid. Additionally, the energy control device (130) may receive load information from the first DC power grid (150-1). The energy control device (130) can determine whether there is a power imbalance in the first DC power grid (150-1) using the information on the state of charge and load received from the first DC power grid (150-1).

[0074] Each of the three DC power grids (150-1, 150-2, 150-3) can transmit power information to an energy control device (130). For example, each DC power grid (150-1, 150-2, 150-3) can transmit information such as its current battery state of charge (SOC) to the energy control device (130). In particular, the first DC power grid (150-1) can also transmit current load information to the energy control device (130). This transmission of information can be done through a communication network (140) (see FIG. 1).

[0075] The energy control device (130) can generate control information based on power information received from three DC power grids (150-1, 150-2, 150-3). The generated control information can be transmitted to the first DC distribution panel (160-1) and the second DC distribution panel (160-2). The two DC distribution panels (160-1, 160-2) can transmit the control information received from the energy control device (130) to the first DC power grid (150-1), the second DC power grid (150-2), and the third DC power grid (150-3), respectively.

[0076] Each DC distribution panel (160-1, 160-2) can transmit control information corresponding to the connected DC power grids (150-1, 150-2, 150-3). For example, the first DC distribution panel (160-1) can transmit control information for the first DC power grid (150-1) and the second DC power grid (150-2), and the second DC distribution panel (160-2) can transmit control information for the first DC power grid (150-1) and the third DC power grid (150-3). This control information may include information for adjusting the power supply amount of each DC power grid.

[0077]

[0078] FIG. 3 is a block diagram of a power distribution device (DC distribution board) according to one embodiment of the present invention.

[0079] Referring to FIG. 3, a power distribution device (DC distribution board, 160-(n-1)) according to one embodiment of the present invention may include a communication module (310), a memory (320), a processor (330), and a switch (340).

[0080] The communication module (310) can transmit and receive data with an external device. For example, the communication module (310) can receive control information by communicating with an energy control device (130) or receive power information by communicating with a DC power grid (150-1, 150-2, to 150-n). Additionally, the communication module (310) can transmit control information generated by the processor (330) to the corresponding DC power grid (150-1, 150-2, to 150-n).

[0081] The memory (320) may be a data storage medium capable of storing or manipulating data, such as an HDD, SSD, etc., or an internal RAM, flash memory, register, etc. included in the processor (330). Program instructions executable by the processor (330) may be stored in the memory (320), and in particular, program instructions that analyze a control signal received from an energy control device (130) and generate a control signal to be transmitted to a corresponding DC power grid (150-1, 150-2, to 150-n) according to the analysis result may be stored.

[0082] The processor (330) may be a central processing unit (CPU) and / or an equivalent computing unit capable of controlling the overall operation of a power distribution device (DC distribution board, 160-(n-1)). The processor may analyze a control signal received from an energy control device (130) using data and program instructions stored in memory (320), and generate a control signal to be transmitted to a corresponding DC power grid (150-1, 150-2, to 150-n) according to the analysis result.

[0083] The switch (340) is a semiconductor device and / or a corresponding switching device that operates under the control of the processor (330) of the power distribution device (160) and can control the flow of power. For example, the switch (340) can connect or disconnect the flow of power between the first DC power grid (150-1) and the second DC power grid (150-2) to the nth DC power grid (150-n) under the control of the processor (330).

[0084] Although not shown, the power distribution device (DC distribution board, 160-(n-1)) may additionally include an interface device capable of receiving additional network data or an input device (not shown) capable of interacting with a user.

[0085] Hereinafter, the operation of a power distribution system (100) according to one embodiment of the present invention will be explained in detail, focusing on the operation of an energy control device (100) and a power distribution device (DC distribution panel, 160-(n-1)).

[0086]

[0087] 1. Normal Operation Mode:

[0088] The AC power grid (110) can supply power to the first DC power grid (150-1). Each DC power grid (150-1 to 150-n) can be operated independently. An energy control device (130) can continuously monitor status information (e.g., power generation amount, battery charge amount, load, etc.) of each DC power grid (150-1 to 150-n). This information can be transmitted to the energy control device (130) via a communication network (140). DC distribution panels (160-1 to 160-(n-1)) can be maintained in a standby state, and power sharing between each DC power grid may not occur.

[0089]

[0090] 2. In case of power imbalance:

[0091] A power shortage may occur in the first DC power grid (150-1). The energy control device (130) can calculate the power shortage amount (Psharing) using the difference between the load power (PLoad) and the supply power (Psupply) of the first DC power grid (150-1). The power shortage amount (Psharing) can be calculated by a preset mathematical formula 1.

[0092] [Mathematical Formula 1]

[0093] Psharing = Psupply - PLoad

[0094] However, Psharing is the power shortage, Psupply is the power supply of the first DC power grid (150-1), and PLoad may be the load power of the first DC power grid (150-1).

[0095] If the power shortage (Psharing) is negative (-), that is, if the power supplied by the first DC power grid (150-1) does not meet the load power, the energy control device (130) can control the power distribution device, i.e., the DC distribution panel (160-1 to 160-(n-1)), to supply power from at least one of the second DC power grid (150-2) to the nth DC power grid (150-n) to the first DC power grid (150-1).

[0096] The energy control device (130) can analyze the received power information to determine the supplyable power amount (PBESS_n) of each of the second DC power grid (150-2) to the nth DC power grid (150-n), and can calculate the total supplyable power amount (PBESS_T) by summing them all. The total supplyable power amount (PBESS_T) can be calculated by a preset mathematical formula 2.

[0097] [Mathematical Formula 2]

[0098]

[0099] However, PBESS_T is the supplyable power amount, and PBESS_i may be the supplyable power of each of the second DC power grid (150-2) to the nth DC power grid (150-n).

[0100]

[0101] 3. Enable Power Sharing:

[0102] The energy control device (130) can determine the amount of power shared by comparing the amount of power shortage (Psharing) and the total amount of power available for supply (PBESS_T).

[0103]

[0104] (1) When the size of Psharing is less than the size of PBESS_T

[0105] The energy control device (130) can control the power distribution device (160) using the state of charge (SOC) of each of the second DC power grid (150-2) to the nth DC power grid (150-n). That is, the higher the state of charge (SOC) of the DC power grid, the more power can be controlled to share with the first DC power grid (150-1). At this time, each DC distribution panel (160-1 to 160-(n-1)) can be individually controlled by the energy control device (130).

[0106] For example, the energy control device (130) can transmit an on control signal corresponding to each DC distribution panel (160-1 to 160-(n-1)). Each DC distribution panel (160-1 to 160-(n-1)) that receives the on control signal can switch the switch (switching element) constituting the DC distribution panel to allow power to be shared with the first DC power network (150-1). Additionally, the energy control device (130) can transmit an off control signal to one or more of each DC distribution panel (160-1 to 160-(n-1)). Each DC distribution panel (160-1 to 160-(n-1)) that receives the off control signal can switch the provided switch (switching element) to prevent power from being shared with the first DC power network (150-1). The criteria for the energy control device (130) to generate an on control signal and an off control signal may be information regarding the state of charge (SOC) of each of the second DC power network (150-2) to the nth DC power network (150-n).

[0107]

[0108] (2) When the size of Psharing is greater than or equal to the size of PBESS_T

[0109] The energy control device (130) can control the power distribution device (160) to supply the entire supplyable power amount (PBESS_T) to the first DC power grid (150-1), and additionally, can control the power of the AC power grid (110) to be supplied to the first DC power grid (150-1).

[0110]

[0111] 4. Return Driving:

[0112] The energy control device (130) can continuously monitor power information of the first DC power grid (150-1) and can control the power supply from the AC power grid (110) to the first DC power grid (150-1) to be stopped when the power shortage (Psharing) of the first DC power grid (150-1) becomes less than the total supplyable power amount (PBESS_T). Additionally, the energy control device (130) can control the power distribution device (160) to return to a standby state when the power shortage of the first DC power grid (150-1) is resolved.

[0113] At this time, each DC power grid (150-1 to 150-n) can be operated independently.

[0114]

[0115] FIG. 4 is a flowchart of a power distribution method according to another embodiment of the present invention.

[0116] Hereinafter, a power distribution method according to another embodiment of the present invention will be described with reference to FIG. 4.

[0117] In step S410, the energy control device (130) can operate the power grid distribution system (100) according to a preset operating policy. For example, the energy control device (130) can periodically collect power information of each DC power grid (150-1 to 150-n) and perform control operations to maintain a stable operating state of the power grid.

[0118] In step S420, the energy control device (130) can monitor power information from the first DC power grid (150-1) to the nth DC power grid (150-n). That is, the energy control device (130) can collect and analyze information such as the power generation amount, load amount, and battery state of charge (SOC) of each DC power grid in real time.

[0119] In step S430, the energy control device (130) can determine that a power imbalance has occurred in the first DC power grid (150-1). For example, if the amount of power supplied by the first DC power grid (150-1) is less than the amount of power loaded, it can be determined that a power imbalance has occurred due to a power shortage.

[0120] In step S440, if the energy control device (130) determines that a power imbalance has occurred, it may transmit state change information to each DC distribution panel (160-1 to 160-(n-1)). The state change information may be information instructing each DC distribution panel (160-1 to 160-(n-1)) to start power sharing between the first DC power grid (150-1) and the second DC power grid (150-2) to the nth DC power grid (150-n).

[0121] In step S445, each DC distribution panel (160-1 to 160-(n-1)) can be changed to a state that allows power sharing between the first DC power grid (150-1) and the second DC power grid (150-2) to the nth DC power grid (150-n).

[0122] In step S450, the energy control device (130) can calculate the power shortage of the first DC power grid and the power supply capacity of the second to nth DC power grids. The power shortage (Psharing) can be calculated by a preset mathematical formula 1.

[0123] [Mathematical Formula 1]

[0124] Psharing = Psupply - PLoad

[0125] However, Psharing is the power shortage, Psupply is the power supply of the first DC power grid (150-1), and PLoad may be the load power of the first DC power grid (150-1).

[0126] In addition, the available power supply (PBESS_T) can be calculated by the preset mathematical formula 2.

[0127] [Mathematical Formula 2]

[0128]

[0129] However, PBESS_T is the supplyable power amount, and PBESS_i may be the supplyable power of each of the second DC power grid (150-2) to the nth DC power grid (150-n).

[0130] In step S460, the energy control device (130) can compare the magnitude of the power shortage and the magnitude of the power supply available.

[0131] In step S470, if the energy control device (130) determines that the magnitude of the power shortage is smaller than the magnitude of the power supplyable, it can control (n-1) power distribution devices using the state of charge (SOC) of each of the second DC power grid to the nth DC power grid. That is, the energy control device (130) can determine the amount of power sharing by considering the state of charge (SOC) of each DC power grid and control power sharing through each DC distribution panel (160-1 to 160-(n-1)).

[0132] In step S480, if the energy control device (130) determines that the magnitude of the power shortage is greater than or equal to the magnitude of the power supplyable amount, it can perform control to supply the entire power supplyable amount and the power of the AC power grid (110) to the first DC power grid (150-1). That is, the energy control device (130) can control to supply all power supplyable amounts from the second DC power grid (150-2) to the nth DC power grid (150-n) to the first DC power grid (150-1), and additionally to receive power from the AC power grid (110).

[0133] Although not illustrated in FIG. 4, the energy control device (130) can continuously monitor power information of the first DC power grid (150-1) and, when the magnitude of the power shortage (Psharing) of the first DC power grid (150-1) becomes less than the magnitude of the total available power supply (PBESS_T), it can control the power supply from the AC power grid (110) to the first DC power grid (150-1) to be stopped. Additionally, the energy control device (130) can control the power distribution device (160) to return to a standby state when the power shortage of the first DC power grid (150-1) is resolved.

[0134] At this time, each DC power grid (150-1 to 150-n) can be operated independently.

[0135]

[0136] As described above, according to the present invention, power sharing between DC power grids (150-1 to 150-n) can be optimized to minimize the power burden on the AC power grid (110) and improve the stability and efficiency of the power distribution system.

[0137]

[0138] Meanwhile, the embodiments described above may be implemented as hardware components, software components, and / or combinations of hardware and software components. For example, the devices, methods, and components described in the embodiments may be implemented using a general-purpose computer or a special-purpose computer, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing unit may execute an operating system (OS) and software applications executed on said operating system. Additionally, the processing unit may access, store, manipulate, process, and generate data in response to the execution of the software. For ease of understanding, the processing unit may be described as being used as a single unit, but those skilled in the art will understand that the processing unit may include multiple processing elements and / or multiple types of processing elements. For example, the processing unit may include multiple processors or one processor and one controller. In addition, other processing configurations, such as parallel processors, are also possible.

[0139] Software may include computer programs, code, instructions, or a combination of one or more of these, and may configure a processing unit to operate as desired or instruct the processing unit independently or collectively. Software and / or data may be permanently or temporarily embodied in any type of machine, component, physical device, virtual equipment, computer storage medium, or device so as to be interpreted by the processing unit or to provide instructions or data to the processing unit. Software may be distributed over networked computer systems and may be stored or executed in a distributed manner. Software and data may be stored on computer-readable recording media.

[0140] The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may store program instructions, data files, data structures, etc., either individually or in combination, and the program instructions recorded on the medium may be those specifically designed and configured for the embodiment or those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0141] The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

[0142]

[0143] The description of the above-described embodiments is merely an example provided with reference to the drawings for a more thorough understanding of the present disclosure, and should not be interpreted as limiting the technical scope of the present disclosure.

Claims

1. A power distribution device connecting a first DC power grid and a second to nth DC power grid; and An energy control device that resolves a power shortage in the first DC power network by controlling the power distribution device when a power shortage occurs in the first DC power network, thereby sharing power from one or more of the second DC power network to the nth DC power network with the first DC power network; Includes, A power distribution system in which the first DC power grid is connected to an AC power grid, and n is a natural number greater than or equal to 2.

2. In Paragraph 1, The above energy control device is, A power distribution system that calculates the amount of power shortage by utilizing the difference between the load power of the first DC power grid and the supply power of the first DC power grid.

3. In Paragraph 2, The above energy control device is, A power distribution system that controls the power distribution device so that, if it is determined that the power of the first DC power network is insufficient based on the result of calculating the power shortage amount, at least one of the powers from the second DC power network to the nth DC power network is supplied to the first DC power network.

4. In Paragraph 3, The above energy control device is, A power distribution system that controls the power distribution device by determining the supplyable power amount of each of the second to nth DC power networks.

5. In Paragraph 4, The above energy control device is, Control the power distribution device using the result of comparing the above power deficit amount and the above power supply amount, A power distribution system in which the above power deficit is calculated by mathematical formula 1 and the above supplyable power is calculated by mathematical formula 2. [Mathematical Formula 1] Psharing = Psupply - PLoad However, the above Psharing is the above power shortage, the above Psupply is the supply power of the above first DC power grid, and the above PLoad is the load power of the above first DC power grid. [Mathematical Formula 2] However, the above PBESS_T is the supplyable power amount, and the above PBESS_i is the supplyable power of each of the second DC power grid to the nth DC power grid.

6. In Paragraph 5, The above energy control device is, A power distribution system that controls the power distribution device using the state of charge (SOC) of each of the second DC power grid to the nth DC power grid when the magnitude of the above power shortage is less than the magnitude of the above power supply capacity.

7. In Paragraph 6, The above energy control device is, A power distribution system that controls the power distribution device so that if the magnitude of the above power shortage is greater than or equal to the magnitude of the above power supply capacity, the above power supply capacity is entirely supplied to the first DC power grid.

8. In Paragraph 7, The above energy control device is, A power distribution system that controls the power of the AC power grid to be supplied to the first DC power grid when the magnitude of the above power shortage is greater than or equal to the magnitude of the above power supply capacity.

9. In Paragraph 8, The above energy control device is, A power distribution system in which power supply from the AC power grid to the first DC power grid is interrupted when the magnitude of the above power shortage amount is less than the magnitude of the above power supply amount.

10. In Paragraph 1, The above power distribution device is, n-1 DC distribution panels (DCSOP) each connecting the first DC power grid and the second to nth DC power grids; A power distribution system including 11. In Paragraph 10, A power distribution system comprising n-1 DC switchboards (DCSOPs) each including semiconductor switching elements individually controlled by the energy control device.

12. A power distribution method performed in a power distribution system comprising a first DC power grid connected to an AC power grid, and a second DC power grid to an nth DC power grid connected to the first DC power grid through a power distribution device, A step of determining whether a power shortage occurs in the first DC power grid; and A step of resolving the power shortage of the first DC power network by controlling the power distribution device when the above power shortage occurs, by sharing power from one or more of the second DC power network to the nth DC power network with the first DC power network; A power distribution method including 13. In Paragraph 12, The step of determining whether the above-mentioned power shortage occurs is, A step of calculating the power deficit using the difference between the load power of the first DC power grid and the supply power of the first DC power grid; A power distribution method including 14. In Paragraph 13, The step of resolving the above power shortage is, A step of controlling the power distribution device such that, if it is determined that the power of the first DC power grid is insufficient based on the result of calculating the power shortage amount, at least one of the powers of the second DC power grid to the nth DC power grid is supplied to the first DC power grid; A power distribution method including 15. In Paragraph 14, The step of controlling the above power distribution device is, A step of determining the supplyable power amount of each of the second to the nth DC power grids and controlling the power distribution device; A power distribution method including 16. In Paragraph 15, The step of controlling the above power distribution device is, A step of controlling the power distribution device using the result of comparing the above power deficit amount and the above power supply available amount; Includes, A power distribution method in which the above power deficit is calculated by mathematical formula 1 and the above supplyable power is calculated by mathematical formula 2. [Mathematical Formula 1] Psharing = Psupply - PLoad However, the above Psharing is the above power shortage, the above Psupply is the supply power of the above first DC power grid, and the above PLoad is the load power of the above first DC power grid. [Mathematical Formula 2] However, the above PBESS_T is the supplyable power amount, and the above PBESS_i is the supplyable power of each of the second DC power grid to the nth DC power grid.

17. In Paragraph 16, The step of controlling the above power distribution device is, If the magnitude of the above power shortage is less than the magnitude of the above supplyable power, a step of controlling the power distribution device using the state of charge (SOC) of each of the second DC power grid to the nth DC power grid; A power distribution method including 18. In Paragraph 17, The step of controlling the above power distribution device is, If the magnitude of the above power deficit is greater than or equal to the magnitude of the above power supply capacity, a step of controlling the power distribution device so that the entire above power supply capacity is supplied to the first DC power grid; A power distribution method including 19. In Paragraph 18, The step of resolving the above power shortage is, A step of controlling the power of the AC power grid to be supplied to the first DC power grid when the magnitude of the above power deficit is greater than or equal to the magnitude of the above power supply capacity; A power distribution method that further includes 20. In Paragraph 19, The step of resolving the above power shortage is, A step of stopping the supply of power from the AC power grid to the first DC power grid when the magnitude of the above power deficit is less than the magnitude of the above power supply capacity; A power distribution method that further includes 21. In Paragraph 12, The step of resolving the above power shortage is, A step of individually controlling n-1 DC distribution boards (DCSOPs) that respectively connect the first DC power grid and the second DC power grid to the nth DC power grid, and sharing power from one or more of the second DC power grid to the nth DC power grid to the first DC power grid; A power distribution method including

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