Power control apparatus and power distribution system

Abstract

The present application relates to a power control apparatus and a power distribution system. The power control apparatus can be arranged between an energy storage device and a power grid, and the power control apparatus comprises a load monitoring circuit and a switch circuit. A first end of the load monitoring circuit can be connected to a communication end of the energy storage device, and a second end of the load monitoring circuit can be connected to the power grid, so as to monitor line load information of the power grid and transmit the line load information to the energy storage device. The switch circuit can be separately connected to an electric energy transmission end of the energy storage device and the power grid, so that the energy storage device carries out electric energy transmission with the power grid on the basis of the line load information. Thus, by means of the embodiments of the present application, the connection between an energy storage device and a power grid is controlled on the basis that line load information can be monitored, so as to provide power support for the power grid.

Description

Power control devices and power distribution systems

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 2024208418221, filed on April 22, 2024, entitled “Electric Power Control Device and Power Distribution System”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of energy storage technology, and in particular to a power control device and a power distribution system. Background Technology

[0004] With social development, electricity demand continues to grow, placing increasing demands on the power supply capacity (or carrying capacity or load capacity) of power distribution systems. However, once constructed, power distribution systems have an upper limit on their power supply capacity, and there may be situations where the power supply capacity of the power distribution system cannot meet the electricity demand.

[0005] Therefore, in order to increase the power supply capacity of the power distribution system, how to connect energy storage devices with a certain power supply capacity to the power distribution system is an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of the above problems, this application provides a power control device and a power distribution system that can connect energy storage devices with a certain power supply capacity to the power distribution system.

[0008] In a first aspect, this application provides a power control device, which is disposed between an energy storage device and a power grid. The power control device includes a load monitoring circuit and a switching circuit. The first end of the load monitoring circuit is connected to the communication end of the energy storage device, and the second end of the load monitoring circuit is connected to the power grid to monitor the line load information of the power grid and transmit the line load information to the energy storage device. The switching circuit is connected to the power transmission end of the energy storage device and the power grid respectively, so that the energy storage device can transmit power to the power grid based on the line load information.

[0009] In this embodiment, the power control device can monitor the line load information of the power grid by setting up a load monitoring circuit and a switching circuit, and transmit the line load information to the energy storage device so that the energy storage device can transmit power to the power grid based on the line load information. This realizes the ability to control the connection between the energy storage device and the power grid based on the monitored line load information, so as to provide power support to the power grid.

[0010] In some embodiments, the switching circuit includes a device interface that can be connected to other energy storage devices, and the first end of the load monitoring circuit is also connected to the device interface to transmit the monitored grid line load information to the other connected energy storage devices.

[0011] In this embodiment, by setting a device interface in the switching circuit that can quickly connect to other energy storage devices, not only can an emergency backup interface be provided for faulty energy storage in emergency situations to quickly connect to emergency energy storage, but also an emergency expansion interface can be provided for heavily loaded energy storage to quickly connect to expanded energy storage. This enables the system to cope with different emergency needs, thereby improving the stability of the power distribution system.

[0012] In some embodiments, the switching circuit includes a first switch and a second switch connected to each other. The first end of the first switch is connected to the power grid, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the power transmission end of the energy storage device, and the device interface is connected to the second end of the first switch and the first end of the second switch, respectively.

[0013] In this embodiment, by setting a first switch and a second switch in the switching circuit, other energy storage devices can be connected quickly and flexibly through the device interface to cope with different emergency needs.

[0014] In some embodiments, when the first switch is closed and the second switch is open, other energy storage devices connected to the device interface transmit power to the power grid to facilitate emergency access to energy storage; when the first switch is closed and the second switch is closed, the energy storage device and other energy storage devices connected to the device interface jointly transmit power to the power grid to flexibly achieve emergency capacity expansion.

[0015] In some embodiments, the load monitoring circuit includes a monitoring circuit and a processing circuit; wherein, a first monitoring terminal of the monitoring circuit is connected to the power grid, and an output terminal of the monitoring circuit is connected to one end of the processing circuit to monitor and output line load information; the other end of the processing circuit is connected to the communication terminal of the energy storage device, and the processing circuit encodes the line load information and transmits the encoded line load information to the energy storage device.

[0016] In this embodiment of the application, by setting a monitoring circuit capable of monitoring line load and a processing circuit capable of encoding the line load information output by the monitoring circuit in the load monitoring circuit, it is possible to monitor line load information and provide power support to the power grid, while also protecting the data security of line load information and improving the transmission efficiency of line load information.

[0017] In some embodiments, the first monitoring terminal of the monitoring circuit is connected to the power grid through a current transformer, which can easily achieve circuit connection without damaging the original power grid lines.

[0018] In some embodiments, the monitoring circuit further includes a second monitoring terminal connected to the power grid to monitor the voltage of the power grid so as to determine the corresponding power information based on the monitored current and voltage of the power grid.

[0019] In some embodiments, the first monitoring terminal and the second monitoring terminal are connected to the same location in the outgoing circuit of the power grid so as to enable the monitoring of line load information and power information when the energy storage device is connected to the outgoing circuit.

[0020] In some embodiments, the first monitoring terminal is connected to the distribution transformer line in the power grid, and the second monitoring terminal is connected to the outgoing circuit in the power grid, so as to enable the monitoring of line load and power information when the energy storage device is connected to the distribution transformer line. In addition, by connecting the second monitoring terminal to the outgoing circuit, it is not necessary to design an opening in the distribution transformer line to connect the second monitoring terminal, which can protect the integrity of the distribution transformer line and thus help improve the stability of the power grid.

[0021] In some embodiments, the power control device further includes a metering component disposed between the switching circuit and the power grid to measure power consumption information.

[0022] In a second aspect, this application provides a power distribution system, including a power grid, an energy storage device, and a power control device as described in any of the first aspects above; the energy storage device is connected to the power grid via the power control device.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 is a schematic diagram of the power distribution system structure corresponding to the power distribution area provided in the embodiment of this application;

[0026] Figure 2 is a schematic diagram of the load change of the power distribution system provided in the embodiment of this application;

[0027] Figure 3 is a schematic diagram of the structure of a power control device provided in some embodiments of this application;

[0028] Figure 4 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application;

[0029] Figure 5 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application;

[0030] Figure 6 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application;

[0031] Figure 7 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application;

[0032] Figure 8 is a schematic diagram of the power distribution system structure corresponding to the power distribution area provided in the embodiment of this application;

[0033] Figure 9 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application;

[0034] Figure 10 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0038] The power control device involved in this application embodiment can be applied to the power distribution system corresponding to the distribution substation; of course, it can also be applied to power distribution systems corresponding to other scenarios.

[0039] For ease of explanation, the following embodiments use the power distribution system corresponding to a power distribution substation as an example. It should be understood that when the power distribution system in this embodiment is used for other scenarios, the implementation principle and technical effects are similar.

[0040] For ease of understanding, the relevant content of the distribution radio area will be introduced and explained first in this embodiment of the application.

[0041] Power systems typically transmit electrical energy from power plants to user equipment locations via ultra-high voltage (UHV), high voltage (HV), and / or medium voltage (MTV) transmission lines. Upon arrival at the user location, transformers at various levels gradually reduce the voltage of the electrical energy in the lines from UHV to HV to MTV. Finally, distribution transformers convert the medium voltage electricity in the medium voltage transmission lines into low voltage electrical energy that can be used by the user equipment. This low voltage electrical energy is then transmitted to each electricity demander (i.e., user equipment) via low voltage outgoing circuits (or load lines).

[0042] Generally, a distribution transformer area refers to a low-voltage power transmission network consisting of a distribution transformer and all its downstream low-voltage outgoing circuits. The number of low-voltage outgoing circuits downstream of the distribution transformer is related to the capacity of the distribution transformer. It should be understood that the larger the capacity of the distribution transformer, the more low-voltage outgoing circuits it has downstream; conversely, the smaller the capacity of the distribution transformer, the fewer low-voltage outgoing circuits it has downstream.

[0043] Figure 1 is a schematic diagram of the power distribution system structure corresponding to the power distribution substation provided in this application embodiment. As shown in Figure 1, the input terminal of the power distribution transformer 10 can be connected to the medium-voltage transmission line 12 through the ring main unit 11, and the output terminal of the power distribution transformer 10 can be connected to the input terminal of m parallel low-voltage outgoing circuits (or simply outgoing circuits) 13. Each low-voltage outgoing circuit 13 is connected to n parallel loads (or load branches). Wherein, m and n are both integers greater than 1.

[0044] As shown in Figure 1, with distribution transformer 10 as the dividing point, the lines above it can be medium voltage lines (e.g., 10kV), and distribution transformer 10 and the lines below it constitute a distribution transformer area.

[0045] Once the power distribution system of a distribution substation is completed, its hardware equipment (such as distribution transformers and low-voltage outgoing circuits) is fixed and has its own upper limit of carrying capacity, which is the maximum load capacity of the distribution substation.

[0046] However, the load of the distribution substation has high volatility, which will have a great impact on the overall power system during peak periods. The distribution transformer and its downstream low-voltage circuits are under high load at this time, and when they exceed their maximum load capacity by a certain percentage, failures or safety accidents may occur. Figure 2 is a schematic diagram of the load change of the distribution system provided in the embodiment of this application. Under normal circumstances, the load of the distribution system is not constant. It is affected by the type of load in the distribution substation and the electricity consumption behavior of users over time. The common residential load shows the variation characteristics shown in Figure 2 (large time fluctuations, with obvious regularity: the load rate during normal periods can be 45% to 50%, the load rate during off-peak periods is less than 40%, the load rate during peak periods can be more than 80%, and the peak load rate can be 89.1%).

[0047] In order to increase the power supply capacity of the power distribution system, energy storage devices with a certain power supply capacity can be connected to the power distribution system. By utilizing the peak-valley time shift characteristics of energy storage, the load rate of the power distribution system can be maintained below the safety line shown in Figure 2, which is conducive to the reliable operation of the power system.

[0048] Therefore, how to reasonably connect energy storage devices with a certain power supply capacity to the power distribution system is an urgent problem to be solved.

[0049] This application proposes a power control device that can conveniently connect energy storage devices to the power distribution system based on line load monitoring, so as to provide power support for the power grid.

[0050] In some embodiments, FIG3 is a schematic diagram of the structure of a power control device provided in some embodiments of the present application. As shown in FIG3, the power control device of the present application embodiment can be disposed between the energy storage device Ese and the power grid Gp to connect the energy storage device Ese to the power grid Gp of the power distribution system.

[0051] For example, the power control device in this application embodiment can be applied to a scenario where the energy storage device Ese is connected to a low-voltage outgoing circuit. Correspondingly, the power control device can be set between the energy storage device Ese and the low-voltage outgoing circuit of the power grid Gp.

[0052] As another example, the power control device in this application embodiment can be applied to a scenario where the energy storage device Ese is connected to the output end of the distribution transformer (or connected to the distribution line). Correspondingly, the power control device can be set between the energy storage device Ese and the distribution line of the power grid Gp (e.g., the output end of the distribution transformer).

[0053] Of course, the power control device in this application embodiment can also be applied to scenarios where energy storage devices are connected in other locations.

[0054] The power control device in this embodiment may include a load monitoring circuit 30 and a switching circuit 31. The second terminal P2 of the load monitoring circuit 30 may be connected to the power grid Gp (the line between the second terminal P2 and the power grid Gp may be referred to as a detection line) to monitor the line load information of the power grid. The line load information may be used to indicate the line load status of the power grid. For example, the line load information in this embodiment may include, but is not limited to, load rate information, which may be used to indicate the ratio of real-time load to maximum carrying capacity.

[0055] For example, the second terminal P2 can be connected to the power grid via an open current transformer (CT); of course, it can also be connected to the power grid in other ways, which will not be described in detail in this application embodiment.

[0056] In this embodiment, the first terminal P1 of the load monitoring circuit 30 can be connected to the communication terminal of the energy storage device Ese (the line between the first terminal P1 and the communication terminal can be referred to as the communication line) to transmit the monitored line load information to the energy storage device, so that the energy storage device can adjust its operating mode according to the line load information. The operating mode may include, but is not limited to, operating state and / or operating power; the operating state of the energy storage device may include, but is not limited to, charging state, discharging state, or standby state.

[0057] In this embodiment, the switching circuit 31 can be connected to the power transmission terminal of the energy storage device Ese and the power grid Gp respectively, so that the energy storage device Ese can transmit power to the power grid based on the line load information.

[0058] For example, one end of the switching circuit 31 can be connected to the power grid Gp, and the other end of the switching circuit 31 can be connected to the power transmission terminal of the energy storage device Ese (the line between the switching circuit 31 and the energy storage device Ese can be referred to as a power line), so that the energy storage device Ese can transmit power to the power grid based on line load information. For example, when the energy storage device is in a charging state, the power grid Gp can supply power to the energy storage device Ese so that the energy storage device Ese can store electrical energy. As another example, when the energy storage device is in a discharging state, the energy storage device Ese can supply power to the power grid Gp so that the power grid Gp can supply power to the load.

[0059] The power control device of this application embodiment can be installed between the energy storage device and the power grid. The power control device includes a load monitoring circuit and a switching circuit. The first terminal of the load monitoring circuit can be connected to the communication terminal of the energy storage device, and the second terminal can be connected to the power grid to monitor the line load information of the power grid and transmit the line load information to the energy storage device. The switching circuit can be connected to the power transmission terminal of the energy storage device and the power grid respectively, allowing the energy storage device to transmit power to the power grid based on the line load information. Therefore, by setting up a load monitoring circuit and a switching circuit, the power control device of this application embodiment can monitor the line load information of the power grid and transmit the line load information to the energy storage device, enabling the energy storage device to transmit power to the power grid based on the line load information. This achieves the goal of controlling the connection between the energy storage device and the power grid based on the monitored line load information, thereby providing power support to the power grid.

[0060] In some embodiments, FIG4 is a schematic diagram of the structure of a power control device provided in other embodiments of the present application. As shown in FIG4, the switching circuit 31 of the present application embodiment may include, but is not limited to, a device interface 310 that can be connected to other energy storage devices, so as to quickly connect to other energy storage devices to meet emergency needs.

[0061] For example, in the event that the originally connected energy storage device malfunctions and requires emergency repair, it can be connected to other energy storage devices through device interface 310, so that other energy storage devices can replace the originally connected energy storage device to transmit power to the grid, thus achieving the purpose of emergency access for energy storage.

[0062] As another example, in the event that the line capacity cannot meet the power supply demand due to load adjustment and emergency capacity expansion is required, it can be connected to other energy storage devices through the device interface 310, so that other energy storage devices can work together with the originally connected energy storage devices to transmit power to the grid, thus flexibly achieving the purpose of emergency capacity expansion.

[0063] In order to facilitate other connected energy storage devices to adjust their operating modes based on line load information, the first terminal P1 of the load monitoring circuit 30 in this embodiment can also be connected to the device interface 310 to transmit the monitored power grid line load information to other connected energy storage devices, so that the other connected energy storage devices can transmit power to the power grid based on the operating mode determined by the line load information.

[0064] As can be seen, in this embodiment of the application, by setting a device interface 310 in the switching circuit 31 that can quickly connect to other energy storage devices, not only can an emergency backup interface be provided for faulty energy storage in emergency situations to quickly connect to emergency energy storage, but also an emergency expansion interface can be provided for heavily loaded energy storage to quickly connect to expanded energy storage. This enables the system to cope with different emergency needs, thereby improving the stability of the power distribution system.

[0065] It should be noted that the device interface 310 in this embodiment can be a general term for any device interface, which may include one device interface or multiple device interfaces. Different device interfaces can be connected to different other energy storage devices to increase emergency response capabilities, thereby further improving the stability of the power distribution system.

[0066] In some embodiments, FIG5 is a schematic diagram of the structure of a power control device provided in other embodiments of the present application. As shown in FIG5, the switching circuit 31 of the present application embodiment may further include a first switch 311 and a second switch 312 connected to each other.

[0067] The first end of the first switch 311 can be connected to the power grid Gp, the second end of the first switch 311 can be connected to the first end of the second switch, the second end of the second switch can be connected to the power transmission end of the energy storage device 10, and the device interface 310 is also connected to the second end of the first switch 311 and the first end of the second switch 312 respectively.

[0068] For example, when the first switch 311 is in the closed state and the second switch 312 is in the open state, other energy storage devices connected to the device interface 310 can transmit electrical energy to the power grid.

[0069] For example, in the event of a failure of the originally connected energy storage device requiring emergency repair, other mobile energy storage devices can be quickly connected through the device interface 310 after the first switch 311 and the second switch 312 are switched to the open state. The first switch 311 is then switched to the closed state, allowing other energy storage devices to replace the originally connected energy storage devices in transmitting power to the grid, thus achieving the purpose of emergency access for energy storage.

[0070] As another example, when the first switch 311 is closed and the second switch 312 is closed, the energy storage device and other energy storage devices connected to the device interface 310 can jointly transmit electrical energy with the power grid.

[0071] For example, in the event that the line capacity cannot meet the power supply demand due to load adjustment and emergency capacity expansion is required, other mobile energy storage devices can be quickly connected through the device interface 310 after the first switch 311 is switched to the open state. Then, the first switch 311 is switched to the closed state, so that other energy storage devices can transmit power to the grid together with the originally connected energy storage devices, thus flexibly achieving the purpose of emergency capacity expansion.

[0072] As can be seen, in this embodiment of the application, by setting the first switch 311 and the second switch 312 in the switching circuit 31, other energy storage devices can be connected more flexibly and reliably through the device interface 310 to cope with different emergency needs.

[0073] It should be noted that the interconnected first switch 311 and second switch 312 in this embodiment can be a general term, which may include a group of interconnected first switches and second switches, or multiple groups of interconnected first switches and second switches. Each group of first switches and second switches is connected to a corresponding device interface.

[0074] For example, in the case of multiple interconnected sets of first and second switches, these sets of interconnected first and second switches can be connected in series and positioned between the power grid and the power transmission end of the energy storage device. Because multiple sets of switches and device interfaces are provided between the power grid and the energy storage device, other corresponding energy storage devices can be quickly and flexibly connected through different device interfaces, thereby further increasing emergency response capabilities.

[0075] In another example, in the case of multiple interconnected first and second switches, the multiple interconnected first and second switches can be arranged in parallel and respectively set between the power grid and the power transmission end of different energy storage devices, so that different energy storage devices can be conveniently controlled to connect to the power grid respectively through the power control device, so as to provide more flexible power support to the power grid, thereby helping to further improve the stability of the power distribution system.

[0076] It should be understood that when multiple sets of interconnected first and second switches are respectively set between the power grid and the power transmission terminals of different energy storage devices, the power control device may include multiple load monitoring circuits 30. The multiple load monitoring circuits 30 may be respectively set between the communication terminals of the power grid and different energy storage devices so that the monitored line load information of the power grid can be transmitted to the corresponding energy storage devices.

[0077] In some embodiments, FIG6 is a schematic diagram of the structure of a power control device provided in other embodiments of this application. As shown in FIG6, the load monitoring circuit 30 of this application embodiment may include a monitoring circuit 301 and a processing circuit 302. The first monitoring terminal of the monitoring circuit 301 (i.e., the second terminal P2 of the load monitoring circuit 30) may be connected to the power grid to monitor and output the line load information of the power grid.

[0078] For example, the first monitoring terminal of the monitoring circuit 301 can directly monitor the line load information of the power grid.

[0079] As another example, the first monitoring terminal of the monitoring circuit 301 can monitor the current of the power grid so that the monitoring circuit 301 can determine the line load information based on the current.

[0080] For example, the first monitoring terminal of the monitoring circuit 301 can be connected to the power grid via a current transformer to monitor the current in the power grid. In this embodiment of the application, the connection method of the first monitoring terminal of the monitoring circuit 301 to the power grid via a current transformer can very conveniently realize the circuit connection without damaging the original lines of the power grid.

[0081] In one possible implementation, when the power control device in this embodiment is applied to a scenario where an energy storage device is connected to a low-voltage outgoing circuit, the first monitoring terminal of the monitoring circuit 301 can be connected to the low-voltage outgoing circuit of the power grid.

[0082] In another possible implementation, when the power control device in this embodiment is applied to a scenario where the energy storage device is connected to the output end of the distribution transformer, the first monitoring terminal of the monitoring circuit 301 can be connected to the distribution line of the power grid (e.g., the output end of the distribution transformer).

[0083] Of course, the monitoring circuit 301 can also monitor the line load information of the power grid in other ways.

[0084] In this embodiment, the output of the monitoring circuit 301 can be connected to one end of the processing circuit 302 to output line load information to the processing circuit 302.

[0085] The other end of the processing circuit 302 in this embodiment (i.e., the first end of the load monitoring circuit 30) can be connected to the communication terminal of the energy storage device. After encoding the line load information, the processing circuit 302 transmits the encoded line load information to the energy storage device, so that the energy storage device can adjust its operating mode according to the line load information. Therefore, the method of encoding the line load information obtained by the monitoring circuit 301 through the processing circuit 302 not only helps protect the data security of the line load information but also improves the transmission efficiency of the line load information.

[0086] As can be seen, in this embodiment of the application, by setting a monitoring circuit capable of monitoring line load and a processing circuit capable of encoding the line load information output by the monitoring circuit in the load monitoring circuit 30, it is possible to monitor line load information and provide power support to the power grid, while also protecting the data security of line load information and improving the transmission efficiency of line load information.

[0087] In some embodiments, based on the above embodiments, the monitoring circuit 301 in this application embodiment may further include a second monitoring terminal (or the third terminal of the load monitoring circuit 30). The second monitoring terminal may be connected to the power grid to monitor the voltage of the power grid so as to determine the corresponding power information based on the monitored current and voltage of the power grid.

[0088] In one possible implementation, when the power control device is applied to a scenario where the energy storage device is connected to a low-voltage outgoing circuit, the first monitoring terminal and the second monitoring terminal in this embodiment can be connected to the same location of the outgoing circuit (or low-voltage outgoing circuit) in the power grid, so as to enable the monitoring of line load information and power information when the energy storage device is connected to the low-voltage outgoing circuit.

[0089] In another possible implementation, where the power control device is used in a scenario where energy storage devices are connected to the output end of a distribution transformer, the first monitoring terminal in this embodiment can be connected to the distribution transformer line in the power grid, and the second monitoring terminal can be connected to the outgoing circuit in the power grid. This allows for the monitoring of line load and power information when the energy storage device is connected to the distribution transformer line. Furthermore, by connecting the second monitoring terminal to the outgoing circuit, it is unnecessary to design an opening in the distribution transformer line to connect to the second monitoring terminal, thus protecting the integrity of the distribution transformer line and improving the stability of the power grid.

[0090] In some embodiments, based on the above embodiments, the power control device in this application embodiment may further include a metering component disposed between the switching circuit 31 and the power grid to measure the power consumption information of the device. Of course, the metering component may also be disposed independently of the power control device between the power control device and the power grid.

[0091] For example, the metering component can be a meter that displays real-time voltage and current values, as well as accumulated electricity, to record the amount of electricity provided or received by the energy storage device, serving as a basis for subsequent electricity usage queries. The meter's display method can include, but is not limited to, digital or analog displays.

[0092] In some embodiments, FIG7 is a schematic diagram of the structure of a power control device provided in other embodiments of this application. As shown in FIG7, the power control device 70 of this application embodiment can be disposed between the energy storage device Ese and the power grid to connect the energy storage device Ese to the power grid of the distribution system. A metering component 71 may also be disposed between the power control device 70 and the power grid.

[0093] The power control device 70 in this embodiment may include a load monitoring circuit 30 and a switching circuit 31; wherein, the switching circuit 31 may include: a device interface 310 that can be connected to other energy storage devices, a first switch 311 and a second switch 312.

[0094] The first terminal P1 of the load monitoring circuit 30 can be connected to the communication terminal of the energy storage device Ese, and the second terminal P2 of the load monitoring circuit 30 can be connected to the power grid to monitor the line load information of the power grid.

[0095] Specifically, the first terminal of the first switch 311 can be connected to the power grid via the metering component 71, the second terminal of the first switch 311 can be connected to the first terminal of the second switch 312, and the second terminal of the second switch 312 can be connected to the power transmission terminal of the energy storage device Ese. The device interface 310 is connected to the second terminal of the first switch 311 and the first terminal of the second switch 312 respectively, so as to facilitate the rapid connection of other energy storage devices. It should be understood that the first switch 311 and the second switch 312 can be switched to the open state, allowing the energy storage device Ese to disconnect from the power system of the distribution substation.

[0096] The load monitoring circuit 30 in this embodiment can monitor the line load information of the power grid and transmit the line load information to the energy storage device Ese, so that the energy storage device can adjust its working mode according to the line load information.

[0097] For ease of understanding, the following embodiments of this application provide exemplary descriptions of the application of the power control device to the connection of the energy storage device on the low-voltage outgoing circuit and the connection of the energy storage device to the output terminal of the distribution transformer.

[0098] Figure 8 is a schematic diagram of the power distribution system structure corresponding to the power distribution area provided in the embodiment of this application. As shown in Figure 8, compared with the power distribution system shown in Figure 1, the output terminal of the power distribution transformer 10 in this embodiment of the application can be connected to the first energy storage device 14 through the power control device 70, and the corresponding second energy storage device 15 can be connected to different low-voltage outgoing circuits 13 through the power control device 70 respectively.

[0099] It should be understood that the connection point of the second energy storage device 15 in different low-voltage outgoing circuits 13 may be different, and the specific connection point can be determined according to the load pressure of the corresponding low-voltage outgoing circuit 13.

[0100] In addition, the number of second energy storage devices 15 in different low-voltage outgoing circuits 13 can be different, and the specific number can be determined according to the load pressure of the corresponding low-voltage outgoing circuit 13.

[0101] As can be seen, in this embodiment of the application, flexible capacity expansion of the low-voltage outgoing circuit is achieved by connecting a second energy storage device to the low-voltage outgoing circuit, and flexible capacity expansion of the distribution transformer line is achieved by connecting a first energy storage device to the output end of the distribution transformer.

[0102] 1) The power control device is used when the energy storage device is connected to the low-voltage outgoing circuit.

[0103] Figure 9 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application. As shown in Figure 9, the first terminal P1 of the load monitoring circuit 30 can be connected to the communication terminal of the energy storage device Ese. For example, the first terminal P1 of the load monitoring circuit 30 can be connected to the communication terminal of the energy storage device Ese via an RS485 communication line.

[0104] The second terminal P2 of the load monitoring circuit 30 can be connected to the overhead three-phase line corresponding to the low-voltage outgoing circuit via an open CT to monitor the line load information at the corresponding location. The third terminal P3 of the load monitoring circuit 30 can be connected to the second terminal of the second switch 312 to connect to the overhead three-phase line corresponding to the low-voltage outgoing circuit through the second switch 312 and the first switch 311 to monitor the voltage information at the corresponding location.

[0105] It should be understood that one end of the metering component 71 in this embodiment can be connected to the first end of the first switch 311 to detect the electrical quantity information at the corresponding location. The other end of the metering component 71 can also be connected to the energy storage device Ese to send the detected electrical quantity information to the energy storage device.

[0106] 2) Application of power control devices when energy storage equipment is connected to the output end of a distribution transformer.

[0107] Figure 10 is a schematic diagram of the structure of a power control device provided in some other embodiments of this application. As shown in Figure 10, the second terminal P2 of the load monitoring circuit 30 can be connected to the distribution transformer line (e.g., the output terminal of the distribution transformer) via an open CT to monitor the line load information at the corresponding location. The third terminal P3 of the load monitoring circuit 30 can be connected to the second terminal of the second switch 312 to connect to the low-voltage outgoing circuit through the second switch 312 and the first switch 311 to monitor the voltage information at the corresponding location. It should be noted that the connection method between the various components in Figure 10 can be a three-phase connection, which is not limited in this application.

[0108] In summary, the power control device in this application embodiment integrates a load monitoring circuit and a switching circuit (including a device interface, a first switch, and a second switch). In addition to realizing line load monitoring and conventional connection of energy storage devices, it can also quickly connect other energy storage devices to meet emergency needs.

[0109] In some embodiments, this application also provides a power distribution system, which may include, but is not limited to, a power grid, energy storage devices, and the power control device provided in any of the above embodiments of this application. The energy storage devices can be connected to the power grid via the power control device.

[0110] The possible implementation methods of the power distribution system in this application embodiment can be referred to the relevant content in the above embodiments, and will not be repeated here.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrical control device, wherein, The power control device is located between the energy storage device and the power grid, and the power control device includes a load monitoring circuit and a switching circuit. The first end of the load monitoring circuit is connected to the communication terminal of the energy storage device, and the second end of the load monitoring circuit is connected to the power grid to monitor the line load information of the power grid and transmit the line load information to the energy storage device. The switching circuit is connected to the power transmission terminal of the energy storage device and the power grid respectively, so that the energy storage device can transmit power to the power grid based on the line load information.

2. The power control device according to claim 1, wherein, The switching circuit includes a device interface that can be connected to other energy storage devices. The first end of the load monitoring circuit is also connected to the device interface to transmit the monitored line load information of the power grid to the connected other energy storage devices.

3. The power control device according to claim 2, wherein, The switching circuit includes a first switch and a second switch connected to each other. The first end of the first switch is connected to the power grid, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the power transmission end of the energy storage device, and the device interface is connected to the second end of the first switch and the first end of the second switch, respectively.

4. The power control device according to claim 2, wherein, When the first switch is closed and the second switch is open, other energy storage devices connected to the device interface transmit electrical energy to the power grid. When the first switch is closed and the second switch is closed, the energy storage device and other energy storage devices connected to the device interface jointly transmit electrical energy with the power grid.

5. The power control device according to any one of claims 1 to 4, wherein, The load monitoring circuit includes: a monitoring circuit and a processing circuit; The first monitoring terminal of the monitoring circuit is connected to the power grid, and the output terminal of the monitoring circuit is connected to one end of the processing circuit to monitor and output the line load information. The other end of the processing circuit is connected to the communication terminal of the energy storage device. After encoding the line load information, the processing circuit transmits the encoded line load information to the energy storage device.

6. The power control device according to claim 5, wherein, The first monitoring terminal of the monitoring circuit is connected to the power grid via a current transformer.

7. The power control device according to claim 5, wherein, The monitoring circuit also includes a second monitoring terminal, which is connected to the power grid to monitor the voltage of the power grid.

8. The power control device according to claim 7, wherein, The first monitoring terminal and the second monitoring terminal are connected to the same location in the outgoing circuit of the power grid.

9. The power control device according to claim 7, wherein, The first monitoring terminal is connected to the distribution transformer line in the power grid, and the second monitoring terminal is connected to the outgoing circuit in the power grid.

10. The power control device according to any one of claims 1 to 9, wherein, The power control device also includes a metering component disposed between the switching circuit and the power grid.

11. A power distribution system, wherein, Includes power grids, energy storage devices, and power control devices as described in any one of claims 1 to 10; The energy storage device is connected to the power grid via the power control device.

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