Power control device and power distribution system

Abstract

The utility model relates to a power control device and a power distribution system, the power control device can be arranged between energy storage equipment and a power grid, and the power control device comprises a load monitoring circuit and a switching circuit. Wherein a first end of the load monitoring circuit can be connected with a communication end of the energy storage equipment, and a second end of the load monitoring circuit can be connected with a power grid so as to monitor line load information of the power grid and transmit the line load information to the energy storage equipment. The switching circuit can be connected with the electric energy transmission end of the energy storage equipment and a power grid so that the energy storage equipment can conduct electric energy transmission with the power grid based on the line load information. Therefore, on the basis that the line load information can be monitored, the energy storage equipment is controlled to be connected with the power grid, and power support is provided for the power grid.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a power control device and a power distribution system. Background Art

[0002] With the development of society, the electricity demand continues to grow, and the requirements for the power supply capacity (or bearing capacity or load capacity) of the power distribution system are also increasing. However, after the construction of the power distribution system is completed, its power supply capacity has an upper limit, and there may be a situation where the power supply capacity of the power distribution system cannot meet the electricity demand.

[0003] 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. Summary of the Utility Model

[0004] In view of the above problems, this application provides a power control device and a power distribution system, which can connect energy storage devices with a certain power supply capacity to the power distribution system.

[0005] In a first aspect, this application provides a power control device. The power control device is arranged between an energy storage device and the power grid. The power control device includes a load monitoring circuit and a switching circuit; wherein, 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 respectively connected to the power transmission end of the energy storage device and the power grid to supply the energy storage device to perform power transmission with the power grid based on the line load information.

[0006] In the embodiments of this application, by setting the load monitoring circuit and the switching circuit, the power control device can monitor the line load information of the power grid and transmit the line load information to the energy storage device, so that the energy storage device can perform power transmission with the power grid based on the line load information, realizing the control of the connection between the energy storage device and the power grid on the basis of monitoring the line load information to provide power support for the power grid.

[0007] In some embodiments, the switching circuit includes a device interface that can access other energy storage devices, and 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 accessed other energy storage devices.

[0008] In the embodiments of this application, by setting a device interface in the switching circuit that can quickly access other energy storage devices, not only can an emergency backup interface be provided for a faulty energy storage to quickly access emergency energy storage in an emergency, but also an emergency expansion interface can be provided for a heavy-load energy storage to quickly access expansion energy storage, realizing the ability to cope with different emergency demand situations, which is beneficial to improving the stability of the power distribution system.

[0009] 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 respectively connected to the second end of the first switch and the first end of the second switch.

[0010] In the embodiments of the present application, by setting the first switch and the second switch in the switching circuit, other energy storage devices can be more flexibly and reliably accessed quickly through the device interface to meet different emergency demand situations.

[0011] In some embodiments, when the first switch is in the closed state and the second switch is in the open state, the other energy storage device connected to the device interface performs power transmission with the power grid, so as to achieve the purpose of emergency access to energy storage; when the first switch is in the closed state and the second switch is in the closed state, the energy storage device and the other energy storage device connected to the device interface jointly perform power transmission with the power grid, so as to flexibly achieve the purpose of emergency capacity expansion.

[0012] In some embodiments, the load monitoring circuit includes a monitoring circuit and a processing circuit; wherein, the first monitoring end of the monitoring circuit is connected to the power grid, and the output end 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 end of the energy storage device, and after encoding the line load information, the processing circuit transmits the encoded line load information to the energy storage device.

[0013] In the embodiments of the present application, by setting a monitoring circuit capable of monitoring line load in the load monitoring circuit and a processing circuit capable of encoding the line load information output by the monitoring circuit, on the basis of realizing the monitoring of line load information and being able to provide power support for the power grid, it is also beneficial to protect the data security of line load information and improve the transmission efficiency of line load information.

[0014] In some embodiments, the first monitoring end of the monitoring circuit is connected to the power grid through a current transformer, which can very conveniently realize circuit connection without damaging the original lines of the power grid.

[0015] In some embodiments, the monitoring circuit further includes a second monitoring end, and the second monitoring end is connected to the power grid to monitor the voltage of the power grid, so as to determine the corresponding power information according to the monitored current and voltage of the power grid.

[0016] In some embodiments, the first monitoring end and the second monitoring end are connected to the same position of the outgoing line loop in the power grid, so as to monitor the line load information and power information when the energy storage device is connected to the outgoing line loop.

[0017] In some embodiments, the first monitoring end is connected to the distribution transformer line in the power grid, and the second monitoring end is connected to the outgoing line loop in the power grid, so as to monitor the line load information and power information when the energy storage device is connected to the distribution transformer line. In addition, by connecting the second monitoring end to the outgoing line loop, it is not necessary to make an opening design for the distribution transformer line to connect the second monitoring end, which can protect the integrity of the distribution transformer line, thereby facilitating the improvement of the stability of the power grid.

[0018] In some embodiments, the power control device further includes a metering component disposed between the switch circuit and the power grid to meter the power consumption information.

[0019] In a second aspect, the present application provides a power distribution system, including a power grid, an energy storage device, and a power control device according to any one of the above first aspects; the energy storage device is connected to the power grid through the power control device.

[0020] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 is a schematic structural diagram of a power distribution system corresponding to a power distribution substation area provided by an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the load change situation of the power distribution system provided by an embodiment of the present application;

[0024] Figure 3 is a schematic structural diagram of a power control device provided by some embodiments of the present application;

[0025] Figure 4 is a schematic structural diagram of a power control device provided by some other embodiments of the present application;

[0026] Figure 5 is a schematic structural diagram of a power control device provided by some other embodiments of the present application;

[0027] Figure 6 is a schematic structural diagram of a power control device provided by some other embodiments of the present application;

[0028] Figure 7 Schematic structural diagram of a power control device provided for other embodiments of the present application;

[0029] Figure 8 Schematic structural diagram of a power distribution system corresponding to a power distribution area provided for an embodiment of the present application Figure 2 ;

[0030] Figure 9 Schematic structural diagram of a power control device provided for other embodiments of the present application;

[0031] Figure 10 Schematic structural diagram of a power control device provided for other embodiments of the present application. Specific embodiments

[0032] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variation thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0035] The power control device involved in the embodiments of the present application can be applied to the power distribution system corresponding to the power distribution area; of course, it can also be applied to the power distribution systems corresponding to other scenarios.

[0036] For the convenience of description, the following embodiments are described by taking the power distribution system of the embodiments of the present application as an example of the power distribution system corresponding to the power distribution area. It should be understood that when the power distribution system of the embodiments of the present application is the power distribution system corresponding to other scenarios, the implementation principles and technical effects are similar.

[0037] For the convenience of understanding, relevant content of the power distribution area is exemplarily introduced and described in the embodiments of the present application.

[0038] The power system usually transmits electrical energy from the power plant end to the location of the electrical user equipment through ultra-high voltage transmission lines, high voltage transmission lines, and / or medium voltage transmission lines. After reaching the location, transformers at each level step down the electrical energy in the line from the voltage levels of ultra-high voltage, high voltage, and medium voltage. Finally, the distribution transformer converts the medium voltage in the medium voltage transmission line into low voltage electrical energy that can be used by the electrical user equipment, and the low voltage outgoing circuit (or load line) transports the low voltage electrical energy to each electrical demand side (i.e., the electrical user equipment).

[0039] Generally, a distribution area refers to a low voltage power transmission network composed of a distribution transformer and all low voltage outgoing circuits downstream of it. Among them, 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 the number of low voltage outgoing circuits downstream of it; the smaller the capacity of the distribution transformer, the fewer the number of low voltage outgoing circuits downstream of it.

[0040] Figure 1 Schematic diagram of the power distribution system structure corresponding to the distribution area provided by the embodiment of the present application Figure 1 , such as Figure 1 shown, the input end of the distribution transformer 10 can be connected to the medium voltage transmission line 12 through the ring main unit 11, and the output end of the distribution transformer 10 can be connected to the input ends of m parallel low voltage outgoing circuits (or simply outgoing circuits) 13. Each low voltage outgoing circuit 13 is connected with n parallel loads (or load branches). Among them, both m and n are integers greater than 1.

[0041] Such as Figure 1 shown, taking the distribution transformer 10 as the demarcation point, the above lines can be medium voltage lines (such as 10 kV), and the distribution transformer 10 and the lines below the distribution transformer 10 form a distribution area.

[0042] After the construction of the power distribution system in the distribution area is completed, its hardware equipment (such as distribution transformers and low voltage outgoing circuits, etc.) is fixed and unchangeable, and they have their own upper limit of bearing capacity, that is, the maximum load capacity of the distribution area.

[0043] However, the load in the distribution area has high volatility and will have a great impact on the overall power system during peak periods. The distribution transformer and its downstream low voltage outgoing circuits are in a high load state at this time. When it exceeds a certain percentage of its maximum load capacity, faults or safety accidents may occur. Figure 2 Schematic diagram of the load change situation of the power distribution system provided by the embodiment of the present application. Generally, the load of the power distribution system is not constant and is affected by the load types in the distribution area, the power consumption behavior of users over time, etc. Common residential loads such as Figure 2The change characteristics shown (with large time fluctuations and obvious regularity: the load factor during normal periods can be 45% - 50%, the load factor during low - valley periods is less than 40%, the load factor during peak periods can be above 80%, and the peak - load factor can be 89.1%).

[0044] In order to increase the power - supply capacity of the distribution system, an energy - storage device with a certain power - supply capacity can be connected to the distribution system. By utilizing the peak - valley time - shifting characteristics of energy storage, the load factor of the distribution system can be maintained below the safety line as shown Figure 2 so as to facilitate the reliable operation of the power system.

[0045] Therefore, how to reasonably connect an energy - storage device with a certain power - supply capacity to the distribution system is an urgent problem to be solved.

[0046] The embodiment of the present application proposes a power control device that can conveniently connect an energy - storage device to the distribution system on the basis of realizing line - load monitoring to provide power support for the power grid.

[0047] In some embodiments, Figure 3 is a schematic structural diagram of the power control device provided in some embodiments of the present application. As shown Figure 3 the power control device of the embodiment of the present application can be arranged 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 distribution system.

[0048] Exemplarily, the power control device in the embodiment of the present application can be applied to the scenario where the energy - storage device Ese is connected to the low - voltage outgoing line. Correspondingly, the power control device can be arranged between the energy - storage device Ese and the low - voltage outgoing line of the power grid Gp.

[0049] Another exemplarily, the power control device in the embodiment of the present application can be applied to the scenario where the energy - storage device Ese is connected to the output end of the distribution transformer (or referred to as connected to the distribution - transformer line). Correspondingly, the power control device can be arranged between the energy - storage device Ese and the distribution - transformer line (such as the output end of the distribution transformer) of the power grid Gp.

[0050] Of course, the power control device in the embodiment of the present application can also be applied to the scenario where the energy - storage device is connected at other positions.

[0051] The power control device in the embodiment of the present application may include a load monitoring circuit 30 and a switching circuit 31. Among them, 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 the detection line) to monitor the line load information of the power grid. Among them, the line load information may be used to indicate the line load condition or the line load condition of the power grid. Exemplarily, the line load information in the embodiment of the present application may include, but is not limited to, load rate information, where the load rate information may be used to indicate the ratio information of the real-time load to the maximum carrying capacity.

[0052] Exemplarily, the second terminal P2 may be connected to the power grid in the manner of an open current transformer (CT); of course, it may also be connected to the power grid in other ways, which will not be elaborated one by one in the embodiment of the present application.

[0053] The first terminal P1 of the load monitoring circuit 30 in the embodiment of the present application may be connected to the communication terminal of the energy storage device Ese (the line between the first terminal P1 and the communication terminal may 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 the working mode of the energy storage device according to the line load information. Among them, the working mode may include, but is not limited to, the working state and / or the working power; the working state of the energy storage device may include, but is not limited to, the charging state, the discharging state, or the standby state.

[0054] The switching circuit 31 in the embodiment of the present application may be respectively connected to the power transmission terminal of the energy storage device Ese and the power grid Gp, so that the energy storage device Ese can perform power transmission with the power grid based on the line load information.

[0055] Exemplarily, one end of the switching circuit 31 may be connected to the power grid Gp, and the other end of the switching circuit 31 may 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 may be referred to as the power supply line), so that the energy storage device Ese can perform power transmission with the power grid based on the line load information. Exemplarily, when the working state of the energy storage device is the charging state, the power grid Gp may transmit power to the energy storage device Ese so that the energy storage device Ese can store electric energy. Another exemplarily, when the working state of the energy storage device is the discharging state, the energy storage device Ese may transmit power to the power grid Gp so that the power grid Gp can supply power to the load.

[0056] The power control device according to the embodiment of the present application can be arranged between the energy storage device and the power grid. The power control device includes a load monitoring circuit and a switching circuit. Among them, the first end of the load monitoring circuit can be connected to the communication end of the energy storage device, and the second end of the load monitoring circuit 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 respectively connected to the power transmission end of the energy storage device and the power grid, so that the energy storage device can perform power transmission with the power grid based on the line load information. It can be seen that the power control device according to the embodiment of the present application can monitor the line load information of the power grid and transmit the line load information to the energy storage device by setting the load monitoring circuit and the switching circuit, so that the energy storage device can perform power transmission with the power grid based on the line load information, realizing the control of the connection between the energy storage device and the power grid on the basis of monitoring the line load information to provide power support for the power grid.

[0057] In some embodiments, Figure 4 is a schematic structural diagram of the power control device provided in another embodiment of the present application. As Figure 4 shown, the switching circuit 31 according to the embodiment of the present application may include, but is not limited to, a device interface 310 that can access other energy storage devices, so as to facilitate quickly accessing other energy storage devices to meet emergency needs.

[0058] Exemplarily, in the case where the originally connected energy storage device fails and needs emergency repair, it can be connected to other energy storage devices through the device interface 310, so that other energy storage devices can replace the originally connected energy storage device to perform power transmission with the power grid, achieving the purpose of emergency access of the energy storage.

[0059] Another exemplarily, in the case where the line capacity cannot meet the power supply demand due to load adjustment and emergency capacity increase is required, it can be connected to other energy storage devices through the device interface 310, so that other energy storage devices can jointly perform power transmission with the originally connected energy storage device with the power grid, flexibly achieving the purpose of emergency capacity expansion.

[0060] In order to facilitate other connected energy storage devices to adjust the working mode based on the line load information, the first end P1 of the load monitoring circuit 30 in the embodiment of the present application can also be connected to the device interface 310 to transmit the monitored line load information of the power grid to the connected other energy storage devices, so that the connected other energy storage devices can perform power transmission with the power grid based on the working mode determined by the line load information.

[0061] It can be seen that in the embodiments of the present application, by setting the device interface 310 in the switching circuit 31 that can quickly access other energy storage devices, not only can an emergency standby interface be provided for the faulty energy storage to quickly access the emergency energy storage in case of emergency, but also an emergency expansion interface can be provided for the heavy-load energy storage to quickly access the expanded energy storage, achieving the ability to cope with different emergency demand situations, which is beneficial to improving the stability of the power distribution system.

[0062] It should be noted that the device interface 310 in the embodiments of the present application can be a general term for device interfaces, which can include one device interface or multiple device interfaces. Among them, different device interfaces can access different other energy storage devices, so as to increase the emergency response ability, which is beneficial to further improving the stability of the power distribution system.

[0063] In some embodiments, Figure 5 is a schematic structural diagram of a power control device provided in other embodiments of the present application. As Figure 5 shown, the switching circuit 31 of the embodiments of the present application may further include a first switch 311 and a second switch 312 connected to each other.

[0064] Among them, 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 respectively connected to the second end of the first switch 311 and the first end of the second switch 312.

[0065] Exemplarily, when the first switch 311 is in the closed state and the second switch 312 is in the open state, the other energy storage device connected to the device interface 310 can perform power transmission with the power grid.

[0066] For example, in the case where the originally connected energy storage device fails and needs emergency repair, after the first switch 311 and the second switch 312 are switched to the open state, a mobile other energy storage device can be quickly accessed through the device interface 310, and the first switch 311 is switched to the closed state, so that the other energy storage device can replace the originally connected energy storage device to perform power transmission with the power grid, achieving the purpose of emergency access of energy storage.

[0067] Another exemplarily, when the first switch 311 is in the closed state and the second switch 312 is in the closed state, the energy storage device and the other energy storage device connected to the device interface 310 can jointly perform power transmission with the power grid.

[0068] For example, in the case where the line capacity cannot meet the power supply demand due to load adjustment and emergency capacity increase is required, after the first switch 311 is switched to the off state, other mobile energy storage devices can be quickly connected through the device interface 310, and the first switch 311 is switched to the on state, so that other energy storage devices can jointly perform power transmission with the originally connected energy storage devices to the power grid, and the purpose of emergency capacity expansion is flexibly achieved.

[0069] It can be seen that in the embodiment of the present application, by setting the first switch 311 and the second switch 312 in the switch circuit 31, other energy storage devices can be more flexibly and reliably connected quickly through the device interface 310 to cope with different emergency demand situations.

[0070] It should be noted that the mutually connected first switch 311 and second switch 312 in the embodiment of the present application can be a general term, which can include a group of mutually connected first switches and second switches, or can include multiple groups of mutually connected first switches and second switches. Among them, each group of first switches and second switches are respectively connected to the corresponding device interface.

[0071] Exemplarily, in the case of including multiple groups of mutually connected first switches and second switches, the multiple groups of mutually connected first switches and second switches can be connected in series and set between the power transmission ends of the power grid and the energy storage device. Since multiple groups of switches and device interfaces are provided between the power grid and the energy storage device, other corresponding energy storage devices can be more flexibly connected quickly through different device interfaces, thereby further increasing the emergency response ability.

[0072] Another exemplarily, in the case of including multiple groups of mutually connected first switches and second switches, the multiple groups of mutually connected first switches and second switches can be arranged in parallel and respectively set between the power transmission ends of the power grid and different energy storage devices, so that the power control device can conveniently control different energy storage devices to be respectively connected to the power grid to provide more flexible power support for the power grid, which is beneficial to further improving the stability of the power distribution system.

[0073] It should be understood that in the case where multiple groups of mutually connected first switches and second switches are respectively set between the power transmission ends of the power grid and different energy storage devices, the power control device can include multiple load monitoring circuits 30, wherein the multiple load detection circuits 30 can be respectively set between the communication ends of the power grid and different energy storage devices, so as to transmit the monitored line load information of the power grid to the corresponding energy storage device.

[0074] In some embodiments, Figure 6 is a schematic structural diagram of a power control device provided in another embodiment of the present application, as Figure 6As shown in the figure, the load monitoring circuit 30 of the embodiment of the present application may include: a monitoring circuit 301 and a processing circuit 302. Among them, the first monitoring end of the monitoring circuit 301 (i.e., the second end 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.

[0075] Exemplarily, the first monitoring end of the monitoring circuit 301 may directly monitor the line load information of the power grid.

[0076] In another exemplary manner, the first monitoring end of the monitoring circuit 301 may monitor the current of the power grid so that the monitoring circuit 301 can determine the line load information according to the current.

[0077] Exemplarily, the first monitoring end of the monitoring circuit 301 may be connected to the power grid through a current transformer to monitor the current of the power grid. In the embodiment of the present application, the connection method of the first monitoring end of the monitoring circuit 301 to the power grid through a current transformer can very conveniently realize the circuit connection without damaging the original line of the power grid.

[0078] In a possible implementation manner, when the power control device in the embodiment of the present application is applied to the scenario where the energy storage device is connected to the low-voltage outgoing line loop, the first monitoring end of the monitoring circuit 301 may be connected to the low-voltage outgoing line loop of the power grid.

[0079] In another possible implementation manner, when the power control device in the embodiment of the present application is applied to the scenario where the energy storage device is connected to the output end of the distribution transformer, the first monitoring end of the monitoring circuit 301 may be connected to the distribution transformer line of the power grid (for example, the output end of the distribution transformer).

[0080] Of course, the monitoring circuit 301 may also monitor the line load information of the power grid in other ways.

[0081] The output end of the monitoring circuit 301 in the embodiment of the present application may be connected to one end of the processing circuit 302 to output the line load information to the processing circuit 302.

[0082] The other end of the processing circuit 302 in the embodiment of the present application (i.e., the first end of the load monitoring circuit 30) may be connected to the communication end 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 the working mode of the energy storage device according to the line load information. It can be seen that by encoding and processing the line load information obtained by the monitoring circuit 301 by the processing circuit 302, it is not only beneficial to protect the data security of the line load information, but also beneficial to improve the transmission efficiency of the line load information.

[0083] It can be seen that in the embodiments of the present application, by providing a monitoring circuit capable of monitoring the line load in the load monitoring circuit 30 and a processing circuit capable of encoding the line load information output by the monitoring circuit, it is possible to realize the monitoring of the line load information and provide power support for the power grid, while also facilitating the protection of the data security of the line load information and improving the transmission efficiency of the line load information.

[0084] In some embodiments, based on the above embodiments, the monitoring circuit 301 in the embodiments of the present application may further include a second monitoring terminal (or referred to as the third terminal of the load monitoring circuit 30). The second monitoring terminal can be connected to the power grid to monitor the voltage of the power grid, so as to determine the corresponding power information according to the monitored current and voltage of the power grid.

[0085] In a possible implementation manner, when the power control device is applied to the scenario where the energy storage device is connected to the low-voltage outgoing line loop, the first monitoring terminal and the second monitoring terminal in the embodiments of the present application can be connected to the same position of the outgoing line loop (or referred to as the low-voltage outgoing line loop) in the power grid, so as to realize the monitoring of the line load information and power information when the energy storage device is connected to the low-voltage outgoing line loop.

[0086] In another possible implementation manner, when the power control device is applied to the scenario where the energy storage device is connected to the output terminal of the distribution transformer, the first monitoring terminal in the embodiments of the present application can be connected to the distribution transformer line in the power grid, and the second monitoring terminal can be connected to the outgoing line loop in the power grid, so as to realize the monitoring of the line load information 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 line loop, it is not necessary to make an opening design for the distribution transformer line to connect the second monitoring terminal, which can protect the integrity of the distribution transformer line, thereby facilitating the improvement of the stability of the power grid.

[0087] In some embodiments, based on the above embodiments, the power control device in the embodiments of the present application may further include a metering component disposed between the switch circuit 31 and the power grid to meter the power consumption information of the device. Of course, the metering component can also be independent of the power control device and be disposed between the power control device and the power grid.

[0088] Exemplarily, the metering component can be a meter, which can display the real-time voltage value and current value, and can also display the accumulated power consumption to record the amount of power provided or received by the energy storage device, as a basis for subsequent power consumption query. Among them, the display method of the meter can include but is not limited to digital display or pointer display.

[0089] In some embodiments, Figure 7 is a schematic structural diagram of the power control device provided in other embodiments of the present application, as Figure 7As shown, the power control device 70 of the embodiment of the present application can be arranged 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. Among them, a metering component 71 can also be arranged between the power control device 70 and the power grid.

[0090] The power control device 70 in the embodiment of the present application can include a load monitoring circuit 30 and a switching circuit 31; among them, the switching circuit 31 can include: a device interface 310 that can access other energy storage devices, a first switch 311, and a second switch 312.

[0091] Among them, the first end P1 of the load monitoring circuit 30 can be connected to the communication end of the energy storage device Ese, and the second end P2 of the load monitoring circuit 30 can be connected to the power grid to monitor the line load information of the power grid.

[0092] Among them, the first end of the first switch 311 can be connected to the power grid through the metering component 71, the second end of the first switch 311 can be connected to the first end of the second switch 312, the second end of the second switch 312 can be connected to the power transmission end of the energy storage device Ese, and the device interface 310 is respectively connected to the second end of the first switch 311 and the first end of the second switch 312, so as to facilitate the quick access of other energy storage devices. It should be understood that the first switch 311 and the second switch 312 can be switched to the off state, so that the energy storage device Ese can be disconnected from the power system of the distribution substation area.

[0093] The load monitoring circuit 30 in the embodiment of the present application 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 the working mode of the energy storage device according to the line load information.

[0094] For ease of understanding, the following embodiments of the present application exemplarily introduce the situations where the power control device is applied to the connection of the energy storage device on the low-voltage outgoing line loop and the connection of the energy storage device at the output end of the distribution transformer.

[0095] Figure 8 Schematic diagram of the power distribution system corresponding to the distribution substation area provided by the embodiment of the present application Figure 2 , as Figure 8 shown, relative to Figure 1 the power distribution system shown, the output end of the distribution transformer 10 in the embodiment of the present application can be connected with a first energy storage device 14 through the power control device 70, and corresponding second energy storage devices 15 can be respectively connected to different low-voltage outgoing line loops 13 through the power control device 70.

[0096] It should be understood that the connection point positions of the second energy storage devices 15 in different low-voltage outgoing line circuits 13 can be different, and the specific connection point positions can be determined according to the load pressure of the corresponding low-voltage outgoing line circuit 13.

[0097] In addition, the numbers of the second energy storage devices 15 in different low-voltage outgoing line circuits 13 can be different, and the specific numbers can be determined according to the load pressure of the corresponding low-voltage outgoing line circuit 13.

[0098] It can be seen that in the embodiments of the present application, by connecting the second energy storage device to the low-voltage outgoing line circuit, the flexible expansion of the low-voltage outgoing line circuit is realized, and by connecting the first energy storage device to the output end of the distribution transformer, the flexible expansion of the distribution transformer line is realized.

[0099] 1) The power control device is applied to the situation where the energy storage device is connected to the low-voltage outgoing line circuit

[0100] Figure 9 The following is a schematic structural diagram of the power control device provided in some other embodiments of the present application. As Figure 9 shown, the first end P1 of the load monitoring circuit 30 can be connected to the communication end of the energy storage device Ese. For example, the first end P1 of the load monitoring circuit 30 can be connected to the communication end of the energy storage device Ese through an RS485 communication line.

[0101] The second end P2 of the load monitoring circuit 30 can be connected to the corresponding overhead three-phase line of the low-voltage outgoing line circuit in an open CT manner to monitor the line load information at the corresponding position. The third end P3 of the load monitoring circuit 30 can be connected to the second end of the second switch 312 to be connected to the corresponding overhead three-phase line of the low-voltage outgoing line circuit through the second switch 312 and the first switch 311 to monitor the voltage information at the corresponding position.

[0102] It should be understood that one end of the metering component 71 in the embodiments of the present application can be connected to the first end of the first switch 311 to detect the power consumption information at the corresponding position. The other end of the metering component 71 can also be connected to the energy storage device Ese to send the detected power consumption information to the energy storage device.

[0103] 2) The power control device is applied to the situation where the energy storage device is connected to the output end of the distribution transformer

[0104] Figure 10 The following is a schematic structural diagram of the power control device provided in some other embodiments of the present application. As Figure 10As shown, the second terminal P2 of the load monitoring circuit 30 can be connected to the distribution transformer line (such as the output terminal of the distribution transformer) through the open CT method to monitor the line load information at the corresponding position. The third terminal P3 of the load monitoring circuit 30 can be connected to the second terminal of the second switch 312 to be connected to the low-voltage outgoing line circuit through the second switch 312 and the first switch 311 to monitor the voltage information at the corresponding position. It should be noted that Figure 10 The connection method between each component in

[0105] In summary, the power control device in the embodiments of the present application integrates a load monitoring circuit and a switch circuit (including a device interface, a first switch, and a second switch). On the basis of realizing line load monitoring and conventional access to energy storage devices, it can also quickly access other energy storage devices to meet emergency needs.

[0106] In some embodiments, the embodiments of the present application further provide a power distribution system, which may include, but is not limited to, a power grid, an energy storage device, and the power control device provided in any of the above embodiments of the present application. Among them, the energy storage device can be connected to the power grid through the power control device.

[0107] For the realizable manner of the power distribution system in the embodiments of the present application, reference can be made to the relevant content in the above embodiments, which will not be elaborated here.

[0108] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power control device, characterized in that, The power control device is arranged between the energy storage device and the power grid, and the power control device includes a load monitoring circuit and a switching circuit; Wherein, 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 respectively connected to the power transmission end of the energy storage device and the power grid, so that the energy storage device can perform power transmission with the power grid based on the line load information; Wherein, the switching circuit includes a device interface for accessing other energy storage devices, and 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 accessed other energy storage devices.

2. The power control device according to claim 1, 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 respectively connected to the second end of the first switch and the first end of the second switch.

3. The power control device according to claim 2, characterized in that, When the first switch is in the closed state and the second switch is in the open state, the other energy storage devices connected to the device interface perform power transmission with the power grid; When the first switch is in the closed state and the second switch is in the closed state, the energy storage device and the other energy storage devices connected to the device interface jointly perform power transmission with the power grid.

4. The power control device according to any one of claims 1 to 3, characterized in that, The load monitoring circuit includes: a monitoring circuit and a processing circuit; Wherein, the first monitoring end of the monitoring circuit is connected to the power grid, and the output end 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 end 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.

5. The power control device according to claim 4, characterized in that, The first monitoring end of the monitoring circuit is connected to the power grid through a current transformer.

6. The power control device according to claim 4, characterized in that, The monitoring circuit further includes a second monitoring end, and the second monitoring end is connected to the power grid to monitor the voltage of the power grid.

7. The power control device according to claim 6, wherein The first monitoring end and the second monitoring end are connected to the same position of the outgoing line loop in the power grid.

8. The power control device according to claim 6, characterized in that, The first monitoring end is connected to the distribution transformer line in the power grid, and the second monitoring end is connected to the outgoing line loop in the power grid.

9. The power control device according to any one of claims 1 to 3, characterized in that, The power control device further includes a metering component arranged between the switching circuit and the power grid.

10. A power distribution system, characterized in that, Including a power grid, an energy storage device and the power control device according to any one of claims 1 to 9; the energy storage device is connected to the power grid through the power control device.

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