Energy storage equipment and electric energy dispatching control method

Abstract

The invention provides energy storage equipment and an electric energy dispatching control method, and relates to the technical field of energy storage systems.The energy storage equipment comprises a control module and an energy storage converter, the energy storage converter is connected with a power grid through a power grid feeder, and an electric meter is arranged on the power grid feeder; the control module is used for controlling the electricity meter to obtain the current flowing direction on a power grid feeder line, if the current flows from the energy storage converter to the power grid, the control module communicates with other energy storage equipment, and at least one part of the current flowing from the energy storage converter to the power grid is transferred to the other energy storage equipment through the energy storage converter; and if the current flows from the power grid to the energy storage converter, communicating with other energy storage equipment, and modifying at least one part of the current obtained from the power grid to be obtained from other energy storage equipment through the energy storage converter. In the technical scheme of the invention, the plurality of energy storage devices are comprehensively scheduled based on the current flow direction on the power grid feeder line, so that the use of electric energy from the power grid is reduced as much as possible, and the power utilization cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of energy storage system technology, and more specifically, to an energy storage device and a power dispatch and control method. Background Technology

[0002] With the transformation of the energy structure and the continuous upgrading of residential electricity demand, small-scale energy storage systems for users (such as balcony photovoltaic energy storage systems) are gaining increasing market acceptance and popularity due to their flexible adaptability to distributed energy utilization scenarios. Especially in some areas with high electricity prices, such energy storage systems have become an important choice for users to reduce electricity bills and optimize household energy configuration.

[0003] In energy storage systems based on related technologies, it is impossible to monitor the electrical energy interaction between the energy storage device and the power grid in real time. Therefore, it is impossible to ensure that the use of electrical energy from the power grid is minimized, or even to achieve zero power supply from the power grid (i.e., the electrical load is completely disconnected from the power grid). Summary of the Invention

[0004] In order to solve or improve the technical problem of being unable to detect the electrical energy interaction status between energy storage devices and the power grid in real time, one object of the present invention is to provide an energy storage device.

[0005] Another objective of this invention is to provide a power dispatch control method.

[0006] To achieve the above objectives, a first aspect of the present invention provides an energy storage device, including a control module and an energy storage converter. The energy storage converter is connected to the power grid via a power grid feeder line, and a meter is installed on the power grid feeder line. The control module controls the energy storage converter and the meter. The control module is used to control the meter to obtain the current flow direction on the power grid feeder line. If the current flow direction is from the energy storage converter to the power grid, the module communicates with other energy storage devices to transfer at least a portion of the current flowing from the energy storage converter to the power grid through the energy storage converter. If the current flow direction is from the power grid to the energy storage converter, the module communicates with other energy storage devices to modify at least a portion of the current obtained from the power grid to be obtained from other energy storage devices through the energy storage converter.

[0007] This invention aims to provide an energy storage device that determines the electrical energy interaction state between the energy storage device and the power grid based on the current flow direction on the power grid feeder lines, and performs comprehensive scheduling of the energy storage device and other energy storage devices. This design can minimize the use of electricity from the power grid, and even achieve zero power supply to the grid, which is beneficial to reducing electricity costs.

[0008] It should be noted that the electrical energy interaction state between energy storage devices and the power grid refers to the energy storage device discharging into the power grid or the energy storage device drawing power from the power grid.

[0009] In some technical solutions, optionally, the control module is specifically used to: if the current flows from the energy storage converter to the grid, stop supplying power to the grid through the energy storage converter, communicate with other energy storage devices, and supply power to other energy storage devices according to the current value; if the current flows from the grid to the energy storage converter, stop obtaining power from the grid through the energy storage converter, communicate with other energy storage devices, and obtain power from other energy storage devices according to the current value.

[0010] In this technical solution, all excess electrical energy that might otherwise be fed into the grid and wasted, as well as supplementary electrical energy that needs to be obtained from the grid, are converted into electrical energy circulation and scheduling within the energy storage system. This can minimize dependence on grid power, effectively reduce the proportion of grid power supply, and even achieve zero grid power feeding, which is conducive to improving the energy utilization efficiency of the entire energy storage system.

[0011] In some technical solutions, communication with other energy storage devices may optionally include at least one of the following: modulating the current value into a high-frequency carrier wave and transmitting it to other energy storage devices via power lines between the two devices; or transmitting the current value to other energy storage devices via wireless communication.

[0012] In this technical solution, neither of the two communication methods requires the laying of traditional communication lines, which helps to reduce wiring costs and workload, and can also improve the accuracy of data acquisition results, thereby providing strong data support for data analysis.

[0013] In some technical solutions, the current value can optionally be modulated into a high-frequency carrier and transmitted to other energy storage devices via power lines, including: obtaining the current wireless network status of the energy storage device; and in response to the wireless network status being a predetermined state, modulating the current value into a high-frequency carrier and transmitting it to other energy storage devices via power lines.

[0014] In this technical solution, in the event of wireless communication failure, core data such as current values ​​are accurately transmitted through power line carrier communication to ensure that other energy storage devices can accurately obtain dispatch instructions, guarantee the precise execution of power dispatch actions, and improve the energy utilization efficiency of the entire energy storage system.

[0015] In some technical solutions, the energy storage device may optionally include a battery module connected to an energy storage converter; the energy storage converter is used to connect the photovoltaic panel and the load device; wherein, when the output power of the photovoltaic panel is greater than the sum of the current demand power of the load device and the charging power of the battery module, the energy storage converter outputs the first difference power between the output power and the first sum power to the grid feeder.

[0016] In this technical solution, by accurately identifying the excess power generation of photovoltaic panels and channeling it to the power grid, energy waste caused by the output power of photovoltaic panels exceeding the load demand and the charging demand of batteries (battery modules) is avoided, which is conducive to improving the energy utilization efficiency of energy storage systems.

[0017] In some technical solutions, optionally, the energy storage converter obtains a second differential power between the current demand power and the second sum power when the second sum of the output power of the photovoltaic panel and the discharge power of the battery module is less than the current demand power of the load device.

[0018] In this technical solution, by monitoring power supply gaps in real time and automatically replenishing power from the grid, problems such as power outages and voltage instability caused by fluctuations in photovoltaic panel power generation (such as no power generation on cloudy days or at night) or insufficient discharge capacity of battery modules are avoided, ensuring the normal operation of load equipment.

[0019] Based on the second differential power, the power grid is accurately obtained, and only the power supply gap of the energy storage system is supplemented. This avoids the waste of electricity caused by excessive power extraction. While ensuring power supply, it also takes into account the economic efficiency of energy utilization, which meets the user's demand for low-cost electricity.

[0020] In some technical solutions, optionally, the energy storage converter is connected to the load device via a load power supply line, and a smart socket is provided on the load power supply line; the control module is communicatively connected to the smart socket, and the control module is used to obtain the current information on the load power supply line through the smart socket.

[0021] In this technical solution, smart sockets collect real-time load power supply line current information, allowing the control module to fully grasp the operating status and power demand of each load device, breaking through the limitations of traditional energy storage systems that have vague load-side information perception. Based on the load-side power parameter information, the control module can dynamically adjust the output power of the energy storage converter and the charging and discharging strategy of the battery module, which is conducive to improving energy utilization efficiency.

[0022] In some technical solutions, the energy storage device may optionally include a first PLC module and a first WIFI module. The first PLC module is used to communicate with a second PLC module of the electricity meter, and the first WIFI module is used to communicate with a second WIFI module of the electricity meter. The control module is electrically connected to the first PLC module and the first WIFI module.

[0023] It should be noted that PLC (Power Line Communication) refers to power line communication or electric power carrier communication. WIFI (Wireless Fidelity) refers to wireless fidelity technology.

[0024] In this technical solution, neither communication method requires the laying of traditional CAN (Controller Area Network) communication lines, which helps to reduce wiring costs and workload, and can also improve the accuracy of data acquisition results, thereby providing strong data support for data analysis.

[0025] A second aspect of the present invention provides a power dispatch control method for an energy storage device in any of the above-described technical solutions. The power dispatch control method includes: controlling a meter to obtain the current flow direction on the power grid feeder; if the current flow direction is from the energy storage converter of the energy storage device to the power grid, then communicating with other energy storage devices to transfer at least a portion of the current flowing from the energy storage converter to the power grid through the energy storage converter to other energy storage devices; if the current flow direction is from the power grid to the energy storage converter, then communicating with other energy storage devices to modify at least a portion of the current obtained from the power grid to be obtained from other energy storage devices through the energy storage converter.

[0026] This invention aims to provide a power dispatch and control method that determines the power interaction state between energy storage devices and the grid based on the current flow direction on the grid feeder lines, and performs comprehensive dispatch of energy storage devices and other energy storage devices. This design can minimize the use of power from the grid, and even achieve zero grid feed, which is beneficial to reducing electricity costs.

[0027] In some technical solutions, optionally, if the current flows from the energy storage converter of the energy storage device to the grid, then communication with other energy storage devices is established to transfer at least a portion of the current flowing from the energy storage converter to the grid through the energy storage converter to other energy storage devices, including: if the current flows from the energy storage converter to the grid, stopping the power supply to the grid through the energy storage converter, and communicating with other energy storage devices to supply power to other energy storage devices according to the current value.

[0028] In this technical solution, all the excess electrical energy that might otherwise be fed into the grid and wasted is converted into electrical energy circulation and scheduling within the energy storage system. This can minimize dependence on grid power, effectively reduce the proportion of grid power supply, and even achieve zero grid power feeding, which is conducive to improving the energy utilization efficiency of the entire energy storage system.

[0029] In some technical solutions, optionally, if the current flows from the grid to the energy storage converter, then communication with other energy storage devices is used to modify at least a portion of the current obtained from the grid to be obtained from other energy storage devices via the energy storage converter. This includes: if the current flows from the grid to the energy storage converter, stopping the power supply from the grid via the energy storage converter and communicating with other energy storage devices to obtain power from other energy storage devices according to the current value.

[0030] In this technical solution, all the supplementary power that originally needed to be obtained from the grid is converted into the internal power circulation and scheduling of the energy storage system. This can minimize the dependence on grid power, effectively reduce the proportion of grid power supply, and even achieve zero grid power feeding, which is conducive to improving the energy utilization efficiency of the entire energy storage system.

[0031] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 A structural block diagram of an energy storage system according to an embodiment of the present invention is shown in an application scenario.

[0033] Figure 2 A structural block diagram of an energy storage device according to an embodiment of the present invention is shown in an application scenario.

[0034] Figure 3 A structural block diagram illustrating a communication connection between an energy storage device and an electricity meter according to an embodiment of the present invention is shown.

[0035] Figure 4 A structural block diagram of an electricity meter according to an embodiment of the present invention is shown;

[0036] Figure 5 A flowchart of a power dispatch control method according to an embodiment of the present invention is shown;

[0037] Figure 6 A flowchart of a power dispatch control method according to another embodiment of the present invention is shown;

[0038] Figure 7 A flowchart of a power dispatch control method according to another embodiment of the present invention is shown;

[0039] Figure 8 A flowchart of a method for achieving zero grid feed through an energy storage device according to an embodiment of the present invention is shown.

[0040] in, Figures 1 to 8 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0041] 1: Energy storage device; 11: Battery module; 12: Energy storage converter; 13: Control module; 14: First PLC module; 15: First WIFI module; 161: Grid feeder line; 162: Power line; 163: Load power supply line; 21: Grid; 22: Load device; 23: User terminal; 24: Photovoltaic panel; 25: Electricity meter; 251: Second PLC module; 252: Second WIFI module; 253: MCU module; 26: Smart socket; 27: Micro inverter; 3: Energy storage system; 32: Energy storage expansion equipment. Detailed Implementation

[0042] To better understand the above-described objectives, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, embodiments of the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0044] With the transformation of the energy structure and the continuous upgrading of residential electricity demand, small-scale energy storage systems for users (such as balcony photovoltaic energy storage systems) are gaining increasing market acceptance and popularity due to their flexible adaptability to distributed energy utilization scenarios. Especially in some areas with high electricity prices, such energy storage systems have become an important choice for users to reduce electricity bills and optimize household energy configuration.

[0045] In energy storage systems based on related technologies, there is a lack of precise detection capabilities for the real-time electrical energy interaction between energy storage devices and the power grid. This makes it impossible to dynamically perceive key operating conditions such as "the power grid supplying power to the load through the energy storage device" and "the energy storage device feeding power back to the grid." Therefore, energy storage systems cannot ensure the priority use of the electrical energy stored in the energy storage device to reduce power consumption from the grid, and it is even more difficult to achieve the core objective of "zero grid feeding" (i.e., the load is completely disconnected from the power grid).

[0046] This invention aims to provide an energy storage device and a power dispatch control method. Based on the current flow direction on the power grid feeder line, it determines the power interaction state between the energy storage device and the power grid, and performs comprehensive dispatch of the energy storage device and other energy storage devices. This design approach has two key advantages: First, it can accurately match the output power of the energy storage device with the power demand of the load, prioritizing the use of power generated by photovoltaic panels and the power stored in the energy storage device, minimizing dependence on grid power, and even achieving the ideal state of zero grid power supply. Second, through closed-loop control, it ensures that the energy storage device achieves energy self-balancing (i.e., self-sufficiency) relying on photovoltaic power generation, effectively reducing users' electricity costs, perfectly meeting users' core needs for low-energy consumption and low-cost electricity, and significantly improving the energy utilization efficiency and economic value of the energy storage device.

[0047] The following reference Figures 1 to 8 This invention describes an energy storage device and a power dispatch control method provided according to some embodiments of the present invention.

[0048] In one embodiment of the present invention, such as Figure 3 As shown, the energy storage device 1 includes a control module 13 and an energy storage converter 12. The energy storage converter 12 is connected to the power grid 21 via a power grid feeder 161, and a meter 25 is installed on the power grid feeder 161. The control module 13 controls the energy storage converter 12 and the meter 25.

[0049] The control module 13 is used to control the meter 25 to obtain the current flow direction on the power grid feeder line 161. If the current flow direction is from the energy storage converter 12 to the power grid 21, it communicates with other energy storage devices 1 to transfer at least a portion of the current flowing from the energy storage converter 12 to the power grid 21 through the energy storage converter 12. If the current flow direction is from the power grid 21 to the energy storage converter 12, it communicates with other energy storage devices 1 to modify at least a portion of the current obtained from the power grid 21 to be obtained from other energy storage devices 1 through the energy storage converter 12.

[0050] The power conversion system 12 (PCS) acts as a power bridge between the energy storage device 1 and the external circuit (photovoltaic panel 24, power grid 21, electrical load, or other energy storage device 1). The power conversion system 12 is used to achieve different types of power conversion.

[0051] Control module 13, as the core control unit of energy storage system 3, is responsible for issuing commands and coordinating control of multiple devices. Control module 13 can obtain the current flow direction on grid feeder line 161 in real time through meter 25. The current flow direction on grid feeder line 161 includes the following two forms: one is from energy storage converter 12 to grid 21, and the other is from grid 21 to energy storage converter 12.

[0052] If the current flows from the energy storage converter 12 to the grid 21, it indicates that the current energy storage device 1 has excess output power and is feeding power into the grid 21. The control module 13 immediately activates the multi-device coordination mechanism, establishes real-time data interaction with other energy storage devices 1 in the energy storage system 3 through a preset communication link (such as power line carrier communication and / or wireless communication), synchronizes the relevant parameters of the current excess current, and issues power transfer commands. The control module 13 controls the energy storage converter 12 of the current energy storage device 1 to adjust its output strategy, transferring at least a portion of the excess current that originally flowed to the grid 21 to other energy storage devices 1 (such as energy storage devices 1 that are in a low-power state and need to be replenished) through the power distribution link, thereby achieving internal digestion and rational distribution of excess power.

[0053] It should be noted that power line carrier communication refers to power line communication.

[0054] When the current flows from the grid 21 to the energy storage converter 12, it indicates that the current output power of the energy storage device 1 is insufficient, and it needs to obtain power from the grid 21 to supplement the load demand. The control module 13 immediately activates the multi-device coordination mechanism, establishes real-time data interaction with other energy storage devices 1 in the energy storage system 3 through a preset communication link (such as power line carrier communication and / or wireless communication), obtains status information such as the remaining capacity and output power of other energy storage devices 1, and then issues power scheduling commands. The control module 13 controls the energy storage converter 12 of the current energy storage device 1 to adjust the power acquisition path, switching at least a portion of the power originally required to be obtained from the grid 21 to be obtained from other energy storage devices 1 (such as energy storage devices 1 in a high-power state with redundant output capabilities), and achieves supply and demand balance through the power complementarity of multiple devices in the energy storage system 3.

[0055] This invention aims to provide an energy storage device 1 that determines the electrical energy interaction state between the energy storage device 1 and the power grid 21 based on the current flow direction on the power grid feeder line 161, and performs comprehensive scheduling of the energy storage device 1 and other energy storage devices. This design can minimize the use of electrical energy from the power grid 21, and even achieve zero power supply to the power grid 21, which is beneficial to reducing electricity costs.

[0056] It should be noted that the electrical energy interaction state between energy storage device 1 and grid 21 refers to energy storage device 1 discharging to grid 21 or energy storage device 1 drawing power from grid 21.

[0057] The advantages of the energy storage device 1 provided by the present invention are as follows:

[0058] Firstly, by transferring excess electrical energy from energy storage device 1 to other power-consuming devices (other energy storage devices 1 that require power), energy waste caused by feeding excess electrical energy into the power grid 21 is avoided. At the same time, when the power of this device (the current energy storage device 1) is insufficient, the power of other energy storage devices 1 is preferentially called, minimizing the acquisition of power from the power grid 21, reducing the user's dependence on the power grid 21, and meeting the demand for low energy consumption and low cost electricity use.

[0059] Secondly, by relying on the multi-device collaborative control mechanism, the independent operation limitations of a single energy storage device 1 are broken, forming a system-level power complementary network, effectively avoiding the problem of power over-feeding or power under-feeding of a single device, which is conducive to improving the stability and continuity of the zero-feeding state of the power grid 21.

[0060] Thirdly, by rationally allocating the power load, we can avoid some energy storage devices 1 from being overcharged, over-discharged, or idle for a long time, so that the operating status of each energy storage device 1 is more stable, reducing the damage to the equipment under extreme conditions, extending the service life of the entire energy storage system 3, and reducing the user's equipment maintenance costs.

[0061] In some embodiments, optionally, such as Figure 1 and Figure 2 As shown, the energy storage system 3 includes multiple energy storage devices 1. The multiple energy storage devices 1 are connected to each other via power line communication or wireless communication.

[0062] Optionally, the energy storage system 3 also includes an energy storage expansion device 32. The energy storage device 1 is used to connect to the corresponding energy storage device 1 to achieve the function of energy storage expansion.

[0063] It should be noted that, Figure 1 In this context, AC (Alternating Current) represents alternating current. Figure 1 In this context, DC (Direct Current) represents direct current. Figure 2 In this context, PLC (Power Line Communication) refers to power line communication. Figure 2 The arrows in the diagram indicate the direction of electrical energy transmission.

[0064] In some embodiments, the energy storage converter 12 may optionally include a grid-connected inverter. The battery module 11 is connected to the power grid 21 via the grid-connected inverter. The grid-connected inverter is used to perform power conversion, converting the AC power from the power grid 21 into the DC power required by the battery module 11 to charge the battery module 11; or converting the DC power from the battery module 11 into the AC power required by the power grid 21 to feed power to the power grid 21.

[0065] In one specific embodiment, meter 25 is a CT (Current Transformer Electricity Meter). A CT meter, also known as a current transformer meter, is an energy metering device that measures large currents through an external current transformer.

[0066] In one specific embodiment, the meter 25 is a smart meter used to obtain power parameter information passing through the power grid feeder line 161.

[0067] In some embodiments, optionally, such as Figure 1 and Figure 2 As shown, energy storage device 1 is used to connect to photovoltaic panel 24 (PV, Photovoltaic). Photovoltaic panel 24 can convert solar energy into electrical energy and transmit the electrical energy to energy storage device 1.

[0068] Optionally, such as Figure 1 As shown, a micro-inverter 27 is installed between the energy storage device 1 and the photovoltaic panel 24. The micro-inverter 27 mainly functions as an energy converter.

[0069] In some embodiments, the integrated energy storage unit (energy storage device 1) optionally comprises a grid-connected inverter, an MPPT (Maximum Power Point Tracking) module controlling multiple PV (photovoltaic panels 24), a battery management system (BMS), and a PLC (Power Line Communication) module. The integrated energy storage unit can also be used to expand the capacity of the energy storage system 3 by adding an additional power supply pack (energy storage expansion device 32).

[0070] It should be noted that since the output power of the photovoltaic panel 24 is affected by factors such as light intensity and ambient temperature (e.g., power increases when light intensity is enhanced and power decreases when temperature is too high), the core function of the MPPT module is to detect the output voltage and current of the photovoltaic panel 24 in real time and dynamically adjust the circuit parameters so that the photovoltaic panel 24 always works at the maximum output power, avoiding photovoltaic energy waste and maximizing the utilization of solar energy.

[0071] The battery charge and discharge management system is the core control unit in energy storage system 3 responsible for monitoring, protecting and optimizing the operating status of the energy storage battery (battery module 11).

[0072] In some embodiments, the control module 13 may optionally determine the current direction and the electrical energy interaction status between the energy storage device 1 and the power grid 21 based on the current value.

[0073] The control module 13 is used to determine that the current flow direction is from the energy storage converter 12 to the power grid 21 when the current value is greater than zero, and that the power interaction state is that the energy storage device 1 transmits power to the power grid 21.

[0074] The control module 13 is used to determine the current flow direction as from the grid 21 to the energy storage converter 12 when the current value is less than zero, and the power interaction state as the grid 21 delivers power to the energy storage device 1.

[0075] The control module 13 is used to determine that there is no electrical energy interaction between the energy storage device 1 and the power grid 21 when the current value is zero.

[0076] In some embodiments, the energy storage device 1 is optionally connected to the load device 22 (an electrical load or a household load). The energy storage device 1 is capable of supplying power to the load device 22.

[0077] Optionally, a smart socket 26 is provided between the energy storage device 1 and the load device 22. In other words, the energy storage device 1 is connected to the smart socket 26, and the smart socket 26 is used to connect to the load device 22. The energy storage device 1 can obtain power parameter information (voltage information and / or current information) through the smart socket 26. The energy storage device 1 controls the on / off state of the circuit through the smart socket 26 to select whether to supply power to the load device 22.

[0078] In some embodiments, optionally, the control module 13 is specifically configured to: if the current flows from the energy storage converter 12 to the grid 21, stop supplying power to the grid 21 through the energy storage converter 12, and communicate with other energy storage devices 1 to supply power to other energy storage devices 1 according to the current value; if the current flows from the grid 21 to the energy storage converter 12, stop obtaining power from the grid 21 through the energy storage converter 12, and communicate with other energy storage devices 1 to obtain power from other energy storage devices 1 according to the current value.

[0079] If the current flows from the energy storage converter 12 to the grid 21, it indicates that the current energy storage device 1 has excess output power and is feeding power into the grid 21. The control module 13 immediately activates the multi-device coordination mechanism, establishes real-time data interaction with other energy storage devices 1 in the energy storage system 3 through a preset communication link (such as power line carrier communication and / or wireless communication), synchronizes the relevant parameters of the current excess current, and issues power transfer commands. The control module 13 immediately activates the feeder disconnection and internal power dispatching mechanism: it cuts off the channel for the energy storage converter 12 to output power to the grid 21, preventing excess power from being fed into the grid 21; it establishes a real-time data connection with other energy storage devices 1 through the system's preset dual-network communication link (power line carrier communication and wireless communication), synchronizes the current value of the current of the current excess current and its own operating status information, calculates the amount of power to be transferred based on the current value, generates a directional power supply dispatching command, and instructs the energy storage converter 12 to adjust its output parameters, so that all the excess power originally intended to be fed into the grid 21 is directionally delivered to other energy storage devices 1 (such as energy storage devices 1 that are in a low power state and need to be replenished with power) according to the power standard corresponding to the detected current value, thereby achieving efficient internal distribution of excess power.

[0080] When the current flows from the grid 21 to the energy storage converter 12, it indicates that the current output power of the energy storage device 1 is insufficient, and it needs to obtain power from the grid 21 to supplement the load demand. The control module 13 immediately activates the multi-device coordination mechanism, establishes real-time data interaction with other energy storage devices 1 in the energy storage system 3 through a preset communication link, obtains status information such as the remaining capacity and output power of other energy storage devices 1, and then issues a power scheduling command. The control module 13 activates the power supply switching and internal power dispatch mechanism: it issues a power-off command to the energy storage converter 12, controls the energy storage converter 12 to stop obtaining power from the grid 21; it obtains parameters such as the remaining capacity and output power of each energy storage device 1, determines the required supplementary power based on the detected current value flowing from the grid 21, sends a precise power request command to the energy storage device 1 with redundant power supply capacity, and obtains sufficient power from other energy storage devices 1 according to the power demand corresponding to the current value, ensuring a stable power supply to the load device 22.

[0081] The excess power that might otherwise be fed into the grid 21 and wasted, as well as the supplementary power that needs to be obtained from the grid 21, are all converted into the power circulation and scheduling within the energy storage system 3. This can minimize the dependence on the power of the grid 21, effectively reduce the proportion of power supplied by the grid 21, and even achieve zero power supply to the grid 21, which is conducive to improving the energy utilization efficiency of the entire energy storage system 3.

[0082] In some embodiments, the control module 13 may optionally communicate with other energy storage devices 1, including at least one of the following: modulating the current value into a high-frequency carrier wave and transmitting it to other energy storage devices 1 via the power line 162 between the control module 1 and other energy storage devices 1; or transmitting the current value to other energy storage devices 1 via wireless communication.

[0083] The communication method between the control module 13 and other energy storage devices 1 is power line carrier communication, that is, the communication method between multiple energy storage devices 1 is power line carrier communication. Alternatively, the communication method between the control module 13 and other energy storage devices 1 is wireless communication, that is, the communication method between multiple energy storage devices 1 is wireless communication.

[0084] Neither of the two communication methods requires the laying of traditional communication lines, which helps reduce wiring costs and workload, and can also improve the accuracy of data acquisition results, thereby providing strong data support for data analysis.

[0085] Since power line carrier communication can be achieved between energy storage devices 1 via existing power lines 162, there is no need to lay traditional communication cables, which helps reduce wiring costs and workload. Because two communication methods are used, communication can still be established through the PLC module even when the WIFI module signal is weak, which helps improve the accuracy of data acquisition results and thus provides strong data support for data analysis.

[0086] In some embodiments, optionally, the current value is modulated into a high-frequency carrier and transmitted to other energy storage devices 1 via power lines 162 between the energy storage devices 1 and other energy storage devices 1, including: obtaining the current wireless network status of the energy storage device 1; and in response to the wireless network status being a predetermined state, modulating the current value into a high-frequency carrier and transmitting it to other energy storage devices 1 via power lines 162 between the energy storage devices 1 and other energy storage devices 1.

[0087] The control module 13 of energy storage device 1 establishes a real-time data connection with other energy storage devices 1 through a preset dual-network communication link (power line carrier communication and wireless communication). Wireless communication has a higher priority than power line carrier communication.

[0088] The predetermined state refers to the inability to receive wireless signals or the poor quality of wireless signals (such as signal strength being lower than the preset threshold or transmission error rate being higher than the set standard). The non-predetermined state refers to the ability to stably receive wireless signals and the signal quality meeting the communication requirements.

[0089] In the event of no wireless signal or poor wireless signal quality, the control module 13 communicates with other energy storage devices 1 via power line carrier communication. In the event of wireless communication failure, core data such as current values ​​are accurately transmitted via power line carrier communication to ensure that other energy storage devices 1 can accurately obtain dispatch instructions, guarantee the precise execution of power dispatch actions, and improve the energy utilization efficiency of the entire energy storage system 3.

[0090] In some embodiments, optionally, such as Figure 2 and Figure 3 As shown, the energy storage device 1 also includes a battery module 11, which is connected to the energy storage converter 12. The energy storage converter 12 is used to connect the photovoltaic panel 24 and the load device 22.

[0091] When the output power of the photovoltaic panel 24 is greater than the sum of the current demand power of the load device 22 and the charging power of the battery module 11, the energy storage converter 12 outputs the first difference power between the output power and the first sum power to the grid feeder line 161.

[0092] The DC power generated by the photovoltaic panel 24 is converted into AC power suitable for the load device 22 by the energy storage converter 12, or into DC power that meets the charging requirements of the battery module 11. The power required by the load device 22 is uniformly distributed and supplied by the energy storage converter 12. At the same time, the control module 13 collects and monitors the output power of the photovoltaic panel 24, the current power demand of the load device 22, and the real-time charging power of the battery module 11 in real time.

[0093] If the output power of the photovoltaic panel 24 is greater than the sum of the current power demand of the load device 22 and the charging power of the battery module 11, it indicates that the power generation (output power) of the photovoltaic panel 24 is excessive. In addition to meeting the real-time power consumption of the load and the full-load charging of the battery module 11, there is still a surplus. The control module 13 controls the energy storage converter 12 to channel the excess power, calculates the first difference power between the output power of the photovoltaic panel 24 and the first sum power (i.e. the power value corresponding to the excess power), and converts the first difference power into power that meets the grid connection standard of the grid 21. The power is then output to the grid 21 side through the grid feeder 161 to realize the compliant grid-connected utilization of excess photovoltaic power.

[0094] By accurately identifying the excess power generation of the photovoltaic panel 24 and channeling it to the power grid 21, energy waste caused by the output power of the photovoltaic panel 24 exceeding the load demand and the charging demand of the battery (battery module 11) is avoided, which is conducive to improving the energy utilization efficiency of the energy storage system 3.

[0095] In some embodiments, optionally, when the second sum of the output power of the photovoltaic panel 24 and the discharge power of the battery module 11 is less than the current demand power of the load device 22, the energy storage converter 12 obtains a second differential power between the current demand power and the second sum power from the grid feeder line 161.

[0096] If the sum of the output power of the photovoltaic panel 24 and the discharge power of the battery module 11 is less than the current power demand of the load device 22, it indicates that the internal power supply capacity of the energy storage system 3 cannot meet the real-time power demand of the load device 22, resulting in a power supply gap. At this time, the control module 13 controls the energy storage converter 12 to draw power from the grid 21, calculates the second power difference between the current power demand of the load device 22 and the sum of the two power values ​​(corresponding to the power gap), and initiates a power draw request to the grid 21 side through the grid feeder line 161. The corresponding power is obtained from the grid 21 according to the calculated second power difference, and the obtained power from the grid 21 is converted into AC power that meets the power consumption standards of the load device 22. This AC power is then supplied to the load device 22 in conjunction with the power output of the photovoltaic panel 24 and the battery module 11, ensuring that the load device 22 receives continuous and stable power support.

[0097] By monitoring power supply gaps in real time and automatically replenishing power from the grid 21, problems such as power outages and voltage instability caused by power generation fluctuations of the photovoltaic panel 24 (such as no power generation on cloudy days or at night) or insufficient discharge capacity of the battery module 11 are avoided, ensuring the normal operation of the load equipment 22.

[0098] Based on the second differential power, the power of the grid 21 is accurately obtained, and only the power supply gap of the energy storage system 3 is supplemented. This avoids the waste of electricity caused by excessive power extraction. While ensuring power supply, it also takes into account the economic efficiency of energy utilization, which meets the user's demand for low-cost electricity.

[0099] In some embodiments, the energy storage converter 12 is optionally connected to the load device 22 via a load power supply line 163, and the load power supply line 163 is provided with a smart socket 26.

[0100] The control module 13 is communicatively connected to the smart socket 26. The control module 13 is used to obtain the current information on the load power supply line 163 through the smart socket 26.

[0101] The control module 13 and the smart socket 26 establish a bidirectional communication connection via a preset dual-network communication link (power line carrier communication and wireless communication). The control module 13 can send data acquisition commands to the smart socket 26. The smart socket 26 responds to the commands of the control module 13, collects power parameter information on the load power supply line 163 through its built-in current detection module, and feeds back the collected power parameter information to the control module 13 in real time through the communication link. The control module 13 analyzes and processes the power parameter information, and, combined with preset load operating parameter thresholds, accurately determines the current operating status of the corresponding load device 22.

[0102] By collecting real-time current information from the load power supply line 163 via the smart socket 26, the control module 13 can fully grasp the operating status and power demand of each load device 22, breaking the limitation of the traditional energy storage system 3's vague perception of load-side information. Based on the load-side power parameter information, the control module 13 can dynamically adjust the output power of the energy storage converter 12 and the charging and discharging strategy of the battery module 11, which is conducive to improving energy utilization efficiency.

[0103] In some embodiments, optionally, such as Figure 3 As shown, the energy storage device 1 also includes a first PLC module 14 and a first WIFI module 15. The first PLC module 14 is used to communicate with the second PLC module 251 of the electricity meter 25, and the first WIFI module 15 is used to communicate with the second WIFI module 252 of the electricity meter 25. The control module 13 is electrically connected to the first PLC module 14 and the first WIFI module 15.

[0104] It should be noted that PLC (Power Line Communication) refers to power line communication or electric power carrier communication. WIFI (Wireless Fidelity) refers to wireless fidelity technology.

[0105] Energy storage device 1 and electricity meter 25 communicate via power line carrier communication through a PLC module. Energy storage device 1 and electricity meter 25 also communicate wirelessly via a WIFI module.

[0106] Neither of the two communication methods requires the laying of traditional CAN (Controller Area Network) communication lines, which helps reduce wiring costs and workload, and can also improve the accuracy of data acquisition results, thereby providing strong data support for data analysis.

[0107] It is important to emphasize that since power line carrier communication can be achieved between the energy storage device 1 and the data acquisition device via the existing power line 162, there is no need to lay out a traditional CAN communication line, which helps reduce wiring costs and workload. Because two communication methods are used, communication can still be established through the PLC module even when the WIFI module signal is weak, which helps improve the accuracy of data acquisition results and thus provides strong data support for data analysis.

[0108] Optionally, the PLC module is externally connected to an isolation coupling transformer and a safety capacitor, with the safety capacitor connected to the power grid 21 (household mains power). The PLC module and the control module 13 exchange data via communication methods such as UART (Universal Asynchronous Receiver / Transmitter), I2C (Inter-Integrated Circuit), and SPI (Serial Peripheral Interface).

[0109] In some embodiments, optionally, such as Figure 4 As shown, the electricity meter 25 includes a second PLC module 251 and an MCU module 253. The MCU module 253 is electrically connected to the second PLC module 251. The MCU module 253 is used to send power parameter information of the load power supply line 163 to the second PLC module 251.

[0110] It should be noted that MCU (Microcontroller Unit) refers to a microcontroller unit.

[0111] Optionally, the power parameter information includes voltage information and / or current information.

[0112] Figure 4 In this context, L (Line) represents the live wire. Figure 4 In this context, N (Neutral) represents the zero line. Figure 4 The arrows in the diagram indicate the direction of data transmission.

[0113] Optionally, in some embodiments, the control module 13 is configured to communicate with the user terminal 23. If the power parameter information obtained via power line carrier communication is inconsistent with the power parameter information obtained via wireless communication, the control module 13 is configured to send a reminder message to the user terminal 23.

[0114] In one embodiment of the present invention, the power dispatch control method is used in the energy storage device 1 in any of the above embodiments.

[0115] like Figure 5 As shown, the power dispatch control method includes:

[0116] S302 controls the meter to obtain the current flow direction on the power grid feeder line.

[0117] The current flow on the power grid feeder line can be in two forms: one is from the energy storage converter to the power grid, and the other is from the power grid to the energy storage converter.

[0118] S304 If the current flows from the energy storage converter of the energy storage device to the grid, then communicate with other energy storage devices to transfer at least a portion of the current flowing from the energy storage converter to the grid through the energy storage converter to other energy storage devices.

[0119] If the current flows from the energy storage converter to the grid, it indicates that the current energy storage device has excess output power and is feeding power back to the grid. The control module immediately activates a multi-device coordination mechanism, establishing real-time data interaction with other energy storage devices in the system through a preset communication link (e.g., power line carrier communication and / or wireless communication), synchronizing relevant parameters of the current excess current, and issuing power transfer commands. The control module controls the energy storage converter of the current energy storage device to adjust its output strategy, transferring at least a portion of the excess current that would otherwise flow to the grid to other energy storage devices (such as those in a low-power state that need to be replenished), thereby achieving internal digestion and rational distribution of excess energy.

[0120] It should be noted that power line carrier communication refers to power line communication.

[0121] S306 If the current flow direction is from the grid to the energy storage converter, then communicate with other energy storage devices to modify at least a portion of the current obtained from the grid to be obtained from other energy storage devices through the energy storage converter.

[0122] When the current flow is from the grid to the energy storage converter, it indicates that the current energy storage device's output power is insufficient, and it needs to obtain power from the grid to supplement the load demand. The control module immediately activates the multi-device coordination mechanism, establishing real-time data interaction with other energy storage devices in the energy storage system through a preset communication link (such as power line carrier communication and / or wireless communication) to obtain status information such as the remaining capacity and output power of other energy storage devices, and then issues power dispatch commands. The control module controls the energy storage converter of the current energy storage device to adjust the power acquisition path, switching at least a portion of the power that originally needed to be obtained from the grid to be obtained from other energy storage devices (such as energy storage devices in a high-power state with redundant output capabilities), thereby achieving supply and demand balance through the power complementarity of multiple devices in the energy storage system.

[0123] This invention aims to provide a power dispatch and control method that determines the power interaction state between energy storage devices and the grid based on the current flow direction on the grid feeder lines, and performs comprehensive dispatch of energy storage devices and other energy storage devices. This design can minimize the use of power from the grid, and even achieve zero grid feed, which is beneficial to reducing electricity costs.

[0124] In some embodiments, optionally, such as Figure 6 As shown, S304 (if the current flow direction is from the energy storage converter of the energy storage device to the grid, then communicate with other energy storage devices to transfer at least a portion of the current flowing from the energy storage converter to the grid through the energy storage converter to other energy storage devices) includes:

[0125] S3042 If the current flows from the energy storage converter to the grid, the energy storage converter stops supplying power to the grid and communicates with other energy storage devices, supplying power to other energy storage devices according to the current value.

[0126] When the current flows from the energy storage converter to the grid, it indicates that the current energy storage device has excess output power and is feeding power into the grid. The control module immediately activates the multi-device coordination mechanism, establishing real-time data interaction with other energy storage devices in the energy storage system through preset communication links (such as power line carrier communication and / or wireless communication), synchronizing relevant parameters of the current excess current, and issuing power transfer commands. The control module immediately activates the power supply interruption and internal power dispatch mechanism: cutting off the channel for the energy storage converter to output power to the grid, preventing excess power from being fed into the grid; establishing real-time data connection with other energy storage devices through the system's preset dual-network communication links (power line carrier communication and wireless communication), synchronizing the current value of the current excess current and its own operating status information, calculating the amount of power to be transferred based on the current value, generating a targeted power supply dispatch command, and instructing the energy storage converter to adjust its output parameters, directing all excess power originally intended to be fed into the grid to other energy storage devices (such as energy storage devices in a low-power state that need to be replenished) according to the power standard corresponding to the detected current value, thus achieving efficient internal distribution of excess power.

[0127] By converting excess electrical energy that might otherwise be fed into the grid and wasted into electrical energy circulation and scheduling within the energy storage system, the dependence on grid power can be minimized, the proportion of grid power supply can be reduced, and even zero grid power feed can be achieved, which is conducive to improving the energy utilization efficiency of the entire energy storage system.

[0128] In some embodiments, optionally, such as Figure 7 As shown, S306 (if the current flow direction is from the grid to the energy storage converter, then communicate with other energy storage devices to modify at least a portion of the current obtained from the grid to be obtained from other energy storage devices via the energy storage converter) includes:

[0129] S3062 If the current flows from the grid to the energy storage converter, the energy storage converter stops obtaining power from the grid and communicates with other energy storage devices to obtain power from them according to the current value.

[0130] When the current flows from the grid to the energy storage converter, it indicates that the current output power of the energy storage device is insufficient, and it needs to obtain power from the grid to supplement the load demand. The control module immediately activates the multi-device coordination mechanism, establishes real-time data interaction with other energy storage devices in the energy storage system through a preset communication link, obtains status information such as the remaining capacity and output power of other energy storage devices, and then issues power scheduling commands. The control module activates the power supply switching and internal power dispatch mechanism: it issues a power-off command to the energy storage converter, controlling the energy storage converter to stop obtaining power from the grid; it obtains parameters such as the remaining capacity and output power of each energy storage device, determines the required supplementary power based on the detected grid current value, sends precise power request commands to energy storage devices with redundant power supply capabilities, and obtains sufficient power from other energy storage devices according to the power demand corresponding to the current value, ensuring a stable power supply to the load devices.

[0131] Converting all the supplementary power that would otherwise need to be obtained from the grid into the internal power circulation and scheduling of the energy storage system can minimize dependence on grid power, effectively reduce the proportion of grid power supply, and even achieve zero grid power feeding, which is conducive to improving the energy utilization efficiency of the entire energy storage system.

[0132] In some embodiments, optionally, such as Figure 8 As shown, methods for achieving zero grid feed through energy storage devices include:

[0133] S402, System Initialization.

[0134] The purpose of this step is to initialize the parameters in the energy storage device.

[0135] S404, WIFI network setup complete.

[0136] The purpose of this step is to establish a communication connection between the first WIFI module of the energy storage device and the second WIFI module of the electricity meter.

[0137] S406, PLC networking completed.

[0138] It should be noted that PLC (Power Line Communication) refers to power line communication.

[0139] The purpose of this step is to establish a communication connection between the first PLC module of the energy storage device and the second PLC module of the electricity meter.

[0140] S408: Obtain electricity meter data and determine the current value based on the electricity meter data.

[0141] It should be noted that "electricity meter data" refers to the power parameter information from the electricity meter.

[0142] S410 determines that the energy storage device is discharging to the grid when the current value is greater than zero.

[0143] S412, when the current value is zero, determines that there is no electrical interaction between the energy storage device and the grid.

[0144] S414, when the current value is less than zero, determines that the energy storage device draws power from the grid.

[0145] S416, the host executes the corresponding strategy for the system based on the current value.

[0146] It should be noted that the host here refers to the energy storage device.

[0147] S418, reduce the output power of the energy storage device, maintain the current output power of the energy storage device, or increase the output power of the energy storage device.

[0148] S420 determines whether the current value is equal to zero.

[0149] Determine if the current value is equal to zero and generate a first determination result. If the first determination result is yes, execute S422; if the first determination result is no, return to S418.

[0150] S422 enables zero power supply to the power grid.

[0151] It should be noted that zero grid feed means that the electrical load is completely disconnected from the power grid.

[0152] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0153] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0154] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0155] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An energy storage device, characterized by, The control module is used for controlling the electric meter to acquire the current flow direction on the grid feeder line, wherein if the current flow direction is from the energy storage converter to the grid, the control module communicates with other energy storage devices, and at least part of the current from the energy storage converter to the grid is transferred to the other energy storage devices through the energy storage converter; if the current flow direction is from the grid to the energy storage converter, the control module communicates with the other energy storage devices, and at least part of the current acquired from the grid is modified to be acquired from the other energy storage devices. The control module is specifically used for:

2. The energy storage device of claim 1, wherein, if the current flow direction is from the energy storage converter to the grid, the control module stops supplying power to the grid through the energy storage converter, and supplies power to the other energy storage devices according to the current value of the current by communicating with the other energy storage devices; if the current flow direction is from the grid to the energy storage converter, the control module stops acquiring power from the grid through the energy storage converter, and acquires power from the other energy storage devices according to the current value of the current by communicating with the other energy storage devices. The communication with the other energy storage devices includes at least one of the following:

3. The energy storage device of claim 1, wherein, modulating the current value into a high-frequency carrier wave, and transmitting the high-frequency carrier wave to the other energy storage devices through a power line between the energy storage device and the other energy storage devices; transmitting the current value to the other energy storage devices through wireless communication. The modulation of the current value into a high-frequency carrier wave, and the transmission of the high-frequency carrier wave to the other energy storage devices through a power line between the energy storage device and the other energy storage devices include:

4. The energy storage device of claim 3, wherein, acquiring the current wireless network state of the energy storage device; in response to the wireless network state being a predetermined state, modulating the current value into the high-frequency carrier wave, and transmitting the high-frequency carrier wave to the other energy storage devices through the power line between the energy storage device and the other energy storage devices. The battery module is further included, and the battery module is connected with the energy storage converter; 5. The energy storage device according to any one of claims 1 to 4, wherein The energy storage converter is used for connecting a photovoltaic panel and a load device; wherein the energy storage converter outputs a first difference power between the output power of the photovoltaic panel and a first sum power of a current demand power of the load device and a charging power of the battery module, when the output power of the photovoltaic panel is greater than the first sum power. The energy storage converter acquires a second difference power between the current demand power and a second sum power of the output power of the photovoltaic panel and a discharging power of the battery module from the grid feeder line, when the second sum power is less than the current demand power of the load device.

6. The energy storage device of claim 5, wherein, The energy storage converter is connected with a load device through a load power supply line, and an intelligent socket is arranged on the load power supply line; 7. The energy storage device according to any one of claims 1 to 4, wherein The control module is in communication connection with the intelligent socket, and the control module is used for acquiring current information on the load power supply line through the intelligent socket. ​ 8. The energy storage device of claim 3, wherein, The energy storage device further comprises a first PLC module and a first WIFI module, the first PLC module is used for being in communication connection with a second PLC module of the electric meter, and the first WIFI module is used for being in communication connection with a second WIFI module of the electric meter. The control module is electrically connected with the first PLC module and the first WIFI module.

9. A method of electrical energy dispatch control, characterized by, The electric energy scheduling control method for the energy storage device as claimed in any one of claims 1 to 8 comprises: The electric meter acquires the current flow direction on the power grid feeder line; If the current flow direction is from the energy storage converter of the energy storage device to the power grid, the other energy storage device is communicated, at least part of the current flowing from the energy storage converter to the power grid is transferred to the other energy storage device through the energy storage converter; If the current flow direction is from the power grid to the energy storage converter, the other energy storage device is communicated, at least part of the current acquired from the power grid is modified to be acquired from the other energy storage device through the energy storage converter.

10. The electrical energy dispatch control method of claim 9, wherein, The if the current flow direction is from the energy storage converter of the energy storage device to the power grid, the other energy storage device is communicated, at least part of the current flowing from the energy storage converter to the power grid is transferred to the other energy storage device through the energy storage converter, comprises: If the current flow direction is from the energy storage converter to the power grid, the power supply to the power grid is stopped through the energy storage converter, and the other energy storage device is communicated, and the power supply is supplied to the other energy storage device according to the current value of the current.

11. The electrical energy dispatch control method of claim 9, wherein, The if the current flow direction is from the power grid to the energy storage converter, the other energy storage device is communicated, at least part of the current acquired from the power grid is modified to be acquired from the other energy storage device through the energy storage converter, comprises: If the current flow direction is from the power grid to the energy storage converter, the power supply acquired from the power grid is stopped through the energy storage converter, and the other energy storage device is communicated, and the power supply is acquired from the other energy storage device according to the current value of the current.

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