Energy scheduling method, energy storage system and storage medium

Abstract

The application relates to the technical field of energy storage, and provides an energy scheduling method, an energy storage system and a storage medium. The method comprises the following steps: acquiring actual grid power; determining schedulable power of an energy storage device according to a device state of the energy storage device; determining allocatable power of the energy storage system based on the schedulable power, the actual grid power and actual power consumption of a controllable load; and allocating given power consumption to the controllable load based on the allocatable power, so as to control the controllable load to operate according to the given power consumption. The above method can improve the energy utilization rate of the energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage, specifically to an energy dispatching method, an energy storage system, and a storage medium. Background Technology

[0002] In the field of energy storage, the energy utilization rate of home energy storage systems is at a low level due to various factors such as natural conditions, the design of energy storage systems, and energy management strategies.

[0003] First, solar energy is significantly affected by weather, seasons, and diurnal variations. For example, power generation is highest at midday on sunny days, while it is almost nonexistent on cloudy days or at night, making it difficult to match household electricity demand with solar power generation. Second, even when solar power generation basically meets household electricity needs, maximum power point tracking (MPPT) will not increase power output, making it difficult to determine if there is redundant capacity and potentially leading to wasted solar power. These factors collectively result in low energy utilization rates for home energy storage systems. Summary of the Invention

[0004] This application provides an energy dispatching method, an energy storage system, and a storage medium to solve the technical problem of low energy utilization in home energy storage systems.

[0005] The first aspect of this application provides an energy dispatching method applied to a controller in an energy storage system. The energy storage system includes a photovoltaic power generation module, an energy storage device, and a power conversion device. The power conversion device is connected to the photovoltaic power generation module and the energy storage device, respectively. The power conversion device is also used to connect to the power grid and a controllable load. The method includes: obtaining the actual grid-feed power; determining the dispatchable power of the energy storage device based on the device status of the energy storage device; determining the allocable power of the energy storage system based on the dispatchable power, the actual grid-feed power, and the actual power consumption of the controllable load; and allocating a given power consumption to the controllable load based on the allocable power, so as to control the controllable load to operate according to the given power consumption.

[0006] Based on the device status of the energy storage device, the dispatchable power of the energy storage device can be reasonably determined in this embodiment. By combining the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, the allocable power of the energy storage system can be reasonably determined. Using the determined allocable power, a certain amount of power consumption can be allocated to the controllable load. This allows for the allocation of a portion of the charging and discharging power of the energy storage device and the actual grid power to the controllable load, attempting to disrupt the balance of household power consumption. In this case, if the photovoltaic power generation module has redundant power generation capacity, it can output more power to maintain the charging and discharging power of the energy storage device and the grid power, improving energy utilization. Even if the photovoltaic power generation module does not have redundant power generation capacity, the allocated power can be fully absorbed by the controllable load without causing energy waste, thereby effectively improving the energy utilization of the household energy storage system.

[0007] A second aspect of this application provides an energy dispatching device, a controller operating in an energy storage system, the energy storage system including a photovoltaic power generation module, an energy storage device, and a power conversion device; the power conversion device is connected to the photovoltaic power generation module and the energy storage device respectively; the power conversion device is also used to connect to the power grid and a controllable load; the device includes: an acquisition unit for acquiring actual grid power; a determination unit for determining the dispatchable power of the energy storage device based on the device status of the energy storage device; the determination unit is also used to determine the allocable power of the energy storage system based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load; and a control unit for allocating a given power consumption to the controllable load based on the allocable power, so as to control the controllable load to operate according to the given power consumption.

[0008] A third aspect of this application provides an energy storage system, comprising: a photovoltaic power generation module, an energy storage device, a controller, and a memory; a power conversion device connected to the photovoltaic power generation module and the energy storage device respectively; the power conversion device further being used to connect to a power grid and a controllable load; the memory being used to store program instructions; and the controller being used to read and execute the program instructions stored in the memory, wherein when the program instructions are executed by the controller, the energy storage system performs the energy dispatching method described in the first aspect.

[0009] A fourth aspect of this application provides a computer storage medium storing program instructions that, when executed on a controller in an energy storage system, cause the energy storage system to perform the energy scheduling method described in the first aspect. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this application.

[0011] Figure 2 This is a flowchart illustrating an energy scheduling method provided in an embodiment of this application.

[0012] Figure 3 This is a schematic diagram illustrating the determination of schedulable power according to an embodiment of this application.

[0013] Figure 4 This is a schematic diagram of an updated display interface provided in an embodiment of this application.

[0014] Figure 5 This is a flowchart illustrating a method for determining the allocatable power after limiting, according to an embodiment of this application.

[0015] Figure 6 This is a flowchart illustrating an energy scheduling method provided in another embodiment of this application.

[0016] Figure 7 This is a schematic diagram of a module of an energy dispatching device provided in an embodiment of this application.

[0017] Figure 8 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or controller devices and / or microcontroller devices.

[0020] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0021] It should be noted that in this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects, not to describe a specific order or sequence.

[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0023] In the field of energy storage, the energy utilization rate of home energy storage systems is at a low level due to various factors such as natural conditions, the design of energy storage systems, and energy management strategies.

[0024] First, solar energy is significantly affected by weather, seasons, and diurnal variations. For example, power generation is highest at midday on sunny days, while it is almost non-existent on cloudy or rainy days or at night, making it difficult to match household electricity demand with solar power generation. Even during peak power generation periods, if household electricity demand is insufficient, excess energy cannot be consumed or stored in a timely manner, resulting in energy waste.

[0025] Secondly, even if the solar power generation basically meets the household's electricity needs, the power generation of the solar power equipment will not continue to increase, even if maximum power tracking is applied. Therefore, it is difficult to determine whether the solar power equipment has redundant power generation capacity, which may lead to some solar power generation capacity being wasted. These factors together result in low energy utilization of home energy storage systems.

[0026] Therefore, in order to improve the energy utilization rate of home energy storage systems, embodiments of this application provide an energy dispatching method. The following is combined with... Figure 1 This application provides a schematic diagram illustrating the structure of an energy storage system according to an embodiment.

[0027] like Figure 1As shown, the energy storage system 100 includes a photovoltaic power generation module 110, an energy storage device 120, and a power conversion device 130. The output terminals of the photovoltaic power generation module 110, the energy storage device 120, and the DC input terminal of the power conversion device 130 are all connected to a DC bus (including a positive DC bus DC_BUS+ and a negative DC bus DC_BUS-). The AC output terminal of the power conversion device 130 is connected to the power grid 200 via an AC bus (including a neutral wire N and a live wire L), and the AC bus is also connected to a controllable load 300. The energy storage system 100 also includes a controller (…). Figure 1 (not shown in the image) and memory ( Figure 1 (Not shown in the image).

[0028] The photovoltaic power generation module 110 may include a plurality of photovoltaic panels. The photovoltaic panels convert light energy into electrical energy to output direct current (DC) to the energy storage device 120, or convert it into alternating current (AC) through the power conversion device 130 for transmission to the load and / or the power grid 200. Understandably, this application does not limit the connection method of the photovoltaic panels in the photovoltaic power generation module 110. For example, in some embodiments, the photovoltaic panels in the photovoltaic power generation module 110 may be connected in series, in parallel, or in a series-then-parallel connection, etc.

[0029] The energy storage device 120 contains one or more battery cells connected in series and / or parallel. The energy storage device 120 may have both energy storage and discharge functions. In some embodiments, the energy storage device 120 may also have a power conversion function, such as an AC to DC conversion function.

[0030] The power conversion device 130 may include a DC-to-AC (DC / AC) conversion unit, which can convert the DC power output from the photovoltaic power generation module 110 and / or energy storage device 120 obtained from the DC bus through the DC input terminal into AC power, and output it to the AC bus to supply power to the controllable load 300 or other types of loads, and / or feed power to the grid 200. Understandably, this application does not limit the specific circuit structure of the DC / AC conversion unit; for example, the DC / AC conversion unit may be a full-bridge topology, a half-bridge topology, etc.

[0031] The power grid 200 can be a municipal power grid or a regional microgrid, etc. Understandably, this application does not limit the AC power type of the power grid 200. In other embodiments, the AC power type of the power grid 200 can be single-phase AC, three-phase AC, or other multi-phase AC, etc.

[0032] The controllable load 300 can be any type of electrical load in a household, or a load in other scenarios. For example, the controllable load 300 can be household electrical equipment such as mobile energy storage devices, charging piles, and smart sockets.

[0033] In some embodiments, the controller in the energy storage system 100 can be used to adjust the power of the controllable load 300. For example, assuming the controllable load 300 is a charging station, the output power of the charging station can be increased or decreased. The controller in the energy storage system 100 can also be used to control the switching of the controllable load 300.

[0034] In other embodiments, the energy storage device 120 can be directly connected to the DC interface of the power conversion device 130, and the photovoltaic power generation module 110 can also be connected to the corresponding photovoltaic input interface of the power conversion device 130. The power conversion device 130 can directly use the power supply of the photovoltaic power generation module 110 or the energy storage device 120 to convert and supply power to the load, or use the power supply of the grid 200 and the photovoltaic power generation module 110 to supply power to the energy storage device 120 and the load. In one embodiment, the power conversion device 130 may also be equipped with an MPPT circuit to achieve maximum power point tracking of the photovoltaic power generation module.

[0035] The load includes both controllable load 300 and uncontrollable load. Normally, when the power grid is supplying power normally, both uncontrollable load and controllable load 300 can be turned on normally. However, when the power supply cannot meet the power demand of all loads, the uncontrollable load will be turned off first.

[0036] The load can be connected via the power conversion device 130 or via a separate power distribution device. That is, the power distribution device can be connected to the power grid 200 and the power conversion device 130 to achieve power supply control for the connected load.

[0037] It should be noted that the energy storage system 100 is only an example. Other existing or future electronic products that are applicable to this application should also be included within the scope of protection of this application and are incorporated herein by reference.

[0038] like Figure 2 The diagram shown is a schematic flowchart of an energy dispatching method provided in an embodiment of this application. The energy dispatching method can be applied to the controller (e.g., in an energy storage system 100) Figure 8 (The controller 140 shown). The order of steps in this flowchart can be changed, and some steps can be omitted, depending on different requirements.

[0039] S201, obtain the actual power of the feeder grid.

[0040] In some embodiments, the actual grid feed power can represent the power transmitted from the energy storage system to the grid, and the actual grid feed power can also represent the power fed from the power conversion equipment to the grid.

[0041] In some embodiments, the actual power fed into the grid can be directly read by a meter installed on the grid side of the AC bus. The meter installed on the AC bus may include, but is not limited to, smart meter boxes and smart meters.

[0042] In other embodiments, the grid-side feed voltage and feed current can be obtained by setting up current sampling circuits and voltage sampling circuits on the grid side, thereby calculating the actual feed power based on the feed voltage and feed current.

[0043] S202, Determine the dispatchable power of the energy storage device based on its equipment status.

[0044] In some embodiments, the device status of an energy storage device may include a charging state and a discharging state. The controller in the energy storage system can determine the dispatchable power of the energy storage device based on its device status. Dispatchable power can represent the power available for use in the energy storage device.

[0045] In some embodiments, the controller determines the dispatchable power of the energy storage device based on the device status of the energy storage device, including: when the energy storage device is in a charging state, determining the dispatchable power of the energy storage device based on the actual charging power of the energy storage device and the state of charge of the energy storage device.

[0046] In this embodiment of the application, when the energy storage device is in a charging state, if the state of charge (SOC) of the energy storage device is greater than or equal to 0% and the state of charge of the energy storage device is less than a first threshold, it indicates that the energy of the energy storage device is too low. At this time, the dispatchable power is configured to 0KW or a smaller value.

[0047] Combination Figure 3 Explain the determination of dispatchable power, such as Figure 3 As shown, when the state of charge of the energy storage device is in the range of [0%, first threshold), it can be determined that the power of the energy storage device cannot be preempted. At this time, the dispatchable power can be 0KW.

[0048] In this embodiment, when the energy storage device is charging and its power is too low, the schedulable power can be configured to 0 kW to ensure that the controllable load will not take away the charging power of the energy storage device.

[0049] In this embodiment, when the energy storage device is in a charging state, if the state of charge (SOC) of the energy storage device is greater than or equal to a first threshold and less than a second threshold, the dispatchable power can be calculated based on the actual charging power of the energy storage device and a first set power. The first set power is a reserved charging power for charging the energy storage device, ensuring that the energy storage device's power is replenished while maximizing power output to the load. The first set power can be set and adjusted according to actual needs, and this application does not impose specific limitations on this.

[0050] In the embodiments of this application, the first threshold and the second threshold can be set and adjusted according to empirical values, and the second threshold is greater than the first threshold. For example, the first threshold can be set to 20% and the second threshold can be set to 70%.

[0051] In one example, the controller can calculate the difference between the actual charging power of the energy storage device and a first set power to obtain the dispatchable power. For example, assuming the first threshold is 20%, the second threshold is 70%, the state of charge of the energy storage device is within the range of [20%, 70%), the first set power is 1KW, and the actual charging power of the energy storage device is 5KW, the dispatchable power can be calculated as: 5KW - 1KW = 4KW.

[0052] Combination Figure 3 Explain the determination of dispatchable power, such as Figure 3 As shown, when the state of charge of the energy storage device is at [first threshold, second threshold), a certain amount of charging power can be reserved for the energy storage device. For example, the charging power reserved for the energy storage device can be the first set power of 1KW. At this time, the dispatchable power can be determined as the difference between the actual charging power of the energy storage device and the first set power.

[0053] In this embodiment, when the state of charge of the energy storage device is greater than or equal to the first threshold and the state of charge of the energy storage device is less than the second threshold, a higher charging power can be reserved for the energy storage device, thereby ensuring that the energy storage device can be successfully charged.

[0054] In this embodiment, when the energy storage device is in a charging state, if the state of charge (SOC) of the energy storage device is greater than or equal to a second threshold and less than 100%, the controller calculates the dispatchable power based on the actual charging power of the energy storage device and a second set power, where the second set power is less than the first set power. For example, if the first set power is 1 kW, the second set power can be set to 0.5 kW. The second set power ensures that the energy storage device will not experience a decrease in power while in a charging state.

[0055] In one example, the controller can calculate the difference between the actual charging power of the energy storage device and a second set power to obtain the dispatchable power. For example, assuming the second threshold is 70%, the state of charge of the energy storage device is within the range of [70%, 100%), the second set power is 0.5KW, and the actual charging power of the energy storage device is 5KW, the dispatchable power can be calculated as: 5KW - 0.5KW = 4.5KW.

[0056] In this embodiment, if the state of charge of the energy storage device reaches 100%, it indicates that the device is fully charged. At this point, the device cannot continue charging. If the device is not in a discharging state, it can be controlled to enter a discharging state, using its rated discharge power as the dispatchable power. The rated discharge power of the energy storage device can be set and adjusted according to its performance characteristics. In this embodiment, when the energy storage device is fully charged, it can be controlled to release a portion of its charge, allowing it to return to a rechargeable state. This ensures that the energy storage device can continue to absorb power from the photovoltaic modules, improving resource utilization.

[0057] In other embodiments, the controller determines the dispatchable power of the energy storage device based on the device status of the energy storage device, and further includes: when the energy storage device is in a discharging state, determining the dispatchable power of the energy storage device based on the actual discharge power of the energy storage device and the rated discharge power of the energy storage device.

[0058] In this embodiment, when the energy storage device is in a discharging state, if the state of charge of the energy storage device is less than a third threshold and greater than a fourth threshold, the dispatchable power of the energy storage device can be determined based on the actual discharge power and the rated discharge power of the energy storage device. The third threshold is less than or equal to 100%, and the fourth threshold is less than the third threshold. In one example, the negative value of the actual discharge power of the energy storage device can be used as the dispatchable power of the energy storage device. For example, when the energy storage device is in a discharging state, assuming the third threshold is 100%, the fourth threshold is 70%, the state of charge of the energy storage device is within the range of (70%, 100%), the actual discharge power of the energy storage device is 3KW, and the rated discharge power of the energy storage device is 5KW, then the dispatchable power is 2KW.

[0059] In this embodiment of the application, when the energy storage device is in a discharge state and the state of charge of the energy storage device is low, for example, below the fourth threshold, the negative value of the actual discharge power of the energy storage device is used as the dispatchable power of the energy storage device. That is, at this time, the power output of the energy storage device needs to be provided by other power sources, thereby reducing the actual dispatchable power.

[0060] In this embodiment, when the energy storage device is in a discharging state, if the state of charge of the energy storage device is high, for example, greater than or equal to the fourth threshold, the difference between the rated discharge power and the actual discharge power of the energy storage device can be calculated to obtain the dispatchable power of the energy storage device, until the state of charge of the energy storage device drops to the fourth threshold. For example, assuming the rated discharge power of the energy storage device is 12KW and the actual discharge power of the energy storage device is 2KW, the dispatchable power can be calculated as: 12KW - 2KW = 10KW.

[0061] When the state of charge (SBC) of an energy storage device drops to the fourth threshold, the dispatchable power of the device can be recalculated. For example, when the SBC of an energy storage device drops to the fourth threshold, discharging can be stopped to maintain the device's charge. If the energy storage device is discharging, the negative value of the actual discharge power can be used as the dispatchable power, as described above. In other words, when the energy storage device stops discharging, the power originally output by the device needs to be supplied by other power sources, thus reducing the actual dispatchable power.

[0062] If the energy storage device switches to a charging state, the dispatchable power of the energy storage device can be calculated according to the strategies corresponding to different states of charge in the charging state, as described above.

[0063] In other embodiments, the dispatchable power can be configured to 0 when the energy storage system is in any of the following preset operating conditions. The preset operating conditions may include, but are not limited to: grid-connected low-power operating condition, off-grid low-power operating condition, shutdown operating condition, automated testing operating condition, storm backup power operating condition, and SOC calibration operating condition.

[0064] S203 determines the allocatable power of the energy storage system based on the dispatchable power, the actual power fed into the grid, and the actual power consumption of the controllable load.

[0065] In some embodiments, a portion of the load has communication capabilities and can communicate with the controller in the energy storage system. In one example, the load with communication capabilities can connect to the controller in the energy storage system via automatic scanning. In another example, the user can also control the connection of the load with communication capabilities to the energy storage system through the display interface of a terminal device. After the load with communication capabilities is connected to the energy storage system, the display interface of the terminal device can be updated. The updated display interface can be as follows: Figure 4 As shown, the updated display interface includes identification information of loads that have been connected to the energy storage system.

[0066] In some embodiments, the controller can acquire status information of the loads connected to the energy storage system. Based on the status information, the controller determines the controllable loads from all loads.

[0067] In the embodiments of this application, the load status information may include one or more of the following: device type, information indicating whether the load supports power regulation, information indicating the operating condition of the load, information indicating the current working state of the load, etc.

[0068] In the embodiments of this application, during the process of determining controllable loads, the controller can identify loads that can be added to the redundant solar control scenario based on the status information, and determine the loads that can be added to the redundant solar control scenario as controllable loads.

[0069] This embodiment can accurately determine the controllable load from the loads connected to the energy storage system by using the load status information.

[0070] In some embodiments, the controller determines the allocatable power of the energy storage system based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, including: obtaining the desired grid power; calculating the difference between the actual grid power and the desired grid power to obtain the redundant grid power; and calculating the sum of the dispatchable power, the redundant grid power, and the actual power consumption to obtain the allocatable power.

[0071] In the embodiments of this application, the desired grid feed power can represent the power set by the energy storage system for grid feeding.

[0072] This embodiment calculates the difference between the actual feeder power and the desired feeder power, subtracting the desired feeder power from the actual feeder power. This avoids adding the desired feeder power to the redundant feeder power, thus allowing for a reasonable determination of the redundant feeder power. By calculating the sum of the dispatchable power, the redundant feeder power, and the actual power consumption, the allocable power can be reasonably obtained.

[0073] In other embodiments, after determining the allocable power of the energy storage system based on the dispatchable power, actual grid power, and actual power consumption of the controllable load, the allocable power can be limited to protect the power conversion equipment, resulting in a limited allocable power. The method for determining the limited allocable power can be found in [reference needed]. Figure 5 The process is shown below.

[0074] S204, based on the allocable power, allocates a fixed power to a controllable load to control the controllable load to operate according to the given power consumption.

[0075] In some embodiments, the controller allocates a given power to a controllable load based on the available power, including: allocating a given power to the corresponding controllable load according to the priority of each controllable load, based on the order of priority from high to low and the rated power of each controllable load, until all available power has been allocated or all controllable loads have participated in the allocation.

[0076] In this embodiment, when the remaining allocable power is greater than or equal to the rated power of the controllable load, the given power of the controllable load can be equal to the rated power of the controllable load. When the remaining allocable power is less than the rated power of the controllable load, the given power of the controllable load can also be equal to the remaining allocable power.

[0077] This embodiment allocates corresponding power consumption to the corresponding controllable loads by prioritizing them, which ensures that important controllable loads can participate in the allocation first. By allocating corresponding power consumption to the corresponding controllable loads based on their rated power consumption, it can be ensured that the controllable loads can operate normally.

[0078] In some embodiments, when all controllable loads have been allocated and there is remaining allocable power, the controller determines the charging and discharging power of the energy storage device based on the remaining allocable power.

[0079] In this embodiment, when all controllable loads have been allocated and there is remaining allocable power, the remaining allocable power can be diverted to the energy storage device by redetermining the charging and discharging power, thereby avoiding energy waste.

[0080] Using the aforementioned energy dispatch method, the dispatchable power of the energy storage equipment can be rationally determined based on its status. By combining the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, the allocable power of the energy storage system can be rationally determined. This allocable power is then used to allocate a portion of the energy storage equipment's charging / discharging power and the actual grid power to the controllable load, attempting to disrupt the balance of household power consumption. In this scenario, if the photovoltaic (PV) power generation modules have redundant power generation capacity, they can output more power to maintain the charging / discharging power of the energy storage equipment and the grid power, improving energy utilization. Even if the PV modules lack redundant power generation capacity, the allocated power can be fully absorbed by the controllable load without energy waste, thus effectively improving the energy utilization rate of the household energy storage system.

[0081] like Figure 5 The diagram shown is a flowchart illustrating a method for determining the allocatable power after limiting, according to an embodiment of this application. The order of steps in the flowchart can be changed or some steps can be omitted depending on different requirements.

[0082] S501, obtain the actual output power and output power limit of the power conversion device.

[0083] In some embodiments, the actual output power of the power conversion device can represent the power output by the power conversion device to the AC bus. The actual output power of the power conversion device can be determined based on the active power of each phase in the AC bus. For example, the actual output power of the power conversion device can be the sum of the active power of each phase in the AC bus.

[0084] In some embodiments, the output power limit of the power conversion device can be determined based on the inverter capability of the power conversion device. In one example, the controller can obtain the rated power of the power conversion device, the high and low temperature derating power of the power conversion device, and the regulatory limit power. The controller determines the power conversion device based on the minimum value among the rated power, the high and low temperature derating power, and the regulatory limit power. This embodiment can reasonably determine the output power limit by combining the inverter capability and the regulatory limit power of the power conversion device.

[0085] S502 calculates the remaining inverter power of the power conversion device based on the output power limit and the actual output power.

[0086] In some embodiments, the controller calculates the difference between the actual output power and the output power limit to obtain the remaining inverter power of the power conversion device.

[0087] S503 performs a limiting process on the allocable power based on the remaining inverter power to obtain the limited allocable power.

[0088] In some embodiments, the controller determines the smaller of the remaining inverter power and the allocable power as the limited allocable power.

[0089] In some embodiments, the controller may allocate a fixed power to the controllable load based on the limited allocable power, so as to control the controllable load to operate according to the given power consumption.

[0090] The embodiments of this application limit the allocable power by using the remaining inverter power of the power conversion device, which can prevent the allocable power after limiting from exceeding the remaining inverter power of the power conversion device, thereby effectively protecting the power conversion device.

[0091] like Figure 6 The diagram shown is a flowchart of an energy scheduling method provided in another embodiment of this application. The order of the steps in the flowchart can be changed or some steps can be omitted depending on different requirements.

[0092] S601, detects whether the power drawn from the grid within a preset time period is continuously greater than or equal to the preset power.

[0093] In some embodiments, the power generation of photovoltaic power generation modules in the energy storage system may experience short-term fluctuations due to factors such as natural conditions. To avoid the impact of short-term fluctuations in power generation, a preset time can be set. The preset time can be set based on empirical values. For example, the preset time can be set to 10 seconds. This application does not impose specific restrictions on the value of the preset time.

[0094] In some embodiments, a preset power can be determined based on the rated power of the energy storage device. In one example, the controller can calculate the preset power by multiplying the rated power of the energy storage device by a first preset coefficient.

[0095] In some embodiments, if the power drawn from the grid is continuously greater than or equal to the preset power within a preset time period, step S602 is executed; if the power drawn from the grid is less than the preset power at any moment within the preset time period, step S603 is executed.

[0096] S602, determine the allocatable power of the energy storage system as the preset configuration power.

[0097] In some embodiments, the preset configuration power can be set to a value less than 0, for example, the preset configuration power can be set to -1.

[0098] In some embodiments, after step S602 is completed, step S605 is executed.

[0099] S603 determines the dispatchable power of the energy storage device based on its device status.

[0100] S604 determines the allocatable power of the energy storage system based on the dispatchable power, the actual grid power of the energy storage system, and the actual power consumption of the controllable load.

[0101] For details on steps S603-S604, please refer to the above text. Figure 2 The detailed description of steps S202-S203 is not repeated here.

[0102] In some embodiments, after step S604 is completed, step S605 is executed.

[0103] S605 determines whether the allocatable power is greater than 0.

[0104] In some embodiments, if the allocatable power is greater than 0, it indicates that there is redundant power in the energy storage system, and step S606 is executed; if the allocatable power is not greater than 0, it indicates that there is no redundant power in the energy storage system, and step S610 is executed.

[0105] S606, determine the controllable load from the loads connected to the energy storage system.

[0106] In some embodiments, the controller acquires the status information of the loads connected to the energy storage system, and determines the controllable loads from all loads based on the status information. The method by which the controller determines the controllable loads can be found in [reference needed]. Figure 2 The method for determining the controllable load in step S203 will not be described again here.

[0107] S607 detects whether the corresponding controllable load is in a stable state according to the priority of each controllable load.

[0108] In some embodiments, the controller detects whether the corresponding controllable load is in a stable state according to the priority of each controllable load from high to low.

[0109] In this embodiment, the controller obtains the actual power consumption and rated power consumption of the corresponding controllable load, and calculates the product of the rated power consumption and a second preset coefficient to obtain the power threshold corresponding to the controllable load. If the difference between the actual power consumption of the controllable load and the power threshold of the controllable load is greater than the set power, it is determined that the controllable load is in an unstable state. If the difference between the actual power consumption of the controllable load and the power threshold of the controllable load is less than or equal to the set power, it is determined that the controllable load is in a stable state.

[0110] In some embodiments, step S608 is executed when the controllable load is in a stable state; and step S609 is executed when the controllable load is in an unstable state.

[0111] S608 allocates a corresponding given power to the controllable load based on the actual power consumption and allocable power of the controllable load.

[0112] In some embodiments, if the allocable power is greater than or equal to the actual power consumption of the controllable load, the actual power consumption of the controllable load is used as the given power consumption corresponding to the controllable load, and the difference between the allocable power and the actual power consumption of the controllable load is calculated to obtain the remaining allocable power. If the allocable power is less than the actual power consumption of the controllable load, the allocable power is used as the given power consumption corresponding to the controllable load, and the allocable power is updated to 0.

[0113] In some embodiments, after step S608 is completed, S607 is repeated until all available power is allocated or all controllable loads have participated in the allocation.

[0114] S609 allocates a corresponding given power to the controllable load based on the rated power consumption and allocable power of the controllable load.

[0115] In some embodiments, if the allocable power is greater than or equal to the rated power of the controllable load, the rated power of the controllable load is used as the given power of the controllable load, and the difference between the allocable power and the rated power of the controllable load is calculated to obtain the remaining allocable power. If the allocable power is less than the rated power of the controllable load, the allocable power is used as the given power of the controllable load, and the allocable power is updated to 0.

[0116] In some embodiments, after step S609 is completed, S606 is repeated until all available power is allocated or all controllable loads have participated in the allocation.

[0117] S610 determines whether the allocatable power is less than 0.

[0118] In some embodiments, if the allocatable power is less than 0, step S611 is executed; if the allocatable power is not greater than 0, it can be said that the allocatable power is equal to 0, and step S612 is executed.

[0119] S611 shuts down the corresponding controllable load based on the priority of the controllable load that has been started.

[0120] In some embodiments, when the allocable power is less than 0, it can indicate that the energy storage system draws power from the grid. In this case, the controller can shut down the corresponding controllable loads in ascending order of priority of the activated controllable loads until the allocable power is 0.

[0121] S612 does not perform power regulation on controllable loads.

[0122] If the allocable power is not greater than 0, it can be said that the allocable power is equal to 0. In this case, there is no redundant power in the energy storage system and the energy storage system does not draw power from the grid. Therefore, power regulation of the controllable load is not required.

[0123] The embodiments of this application, through the allocation of power, can reasonably control the operation of controllable loads, enabling the controllable loads to be activated to absorb excess energy when the allocation of power is high, and to be shut down when the allocation of power is low. This effectively avoids the situation of drawing power from the grid to power the controllable loads, thereby improving the utilization rate and overall economic benefits of the energy storage system.

[0124] like Figure 7The diagram shown is a schematic representation of an energy dispatching device according to an embodiment of this application. The energy dispatching device 71 operates as a controller in an energy storage system, which includes photovoltaic power generation modules, energy storage devices, and power conversion devices. The power conversion devices are connected to the photovoltaic power generation modules and the energy storage devices, respectively. The power conversion devices are also used to connect to the power grid and controllable loads. The energy dispatching device 71 includes an acquisition unit 710, a determination unit 711, a control unit 712, a calculation unit 713, and a processing unit 714. The module / unit referred to in this application refers to a module that can be controlled by a controller (e.g., a controller module). Figure 8 A series of computer-readable instruction segments acquired by the controller 140 shown, and capable of performing a fixed function, which are stored in memory (e.g., a memory for...). Figure 8 In the memory 150 shown.

[0125] In some embodiments, the acquisition unit 710 is used to acquire the actual grid power; the determination unit 711 is used to determine the dispatchable power of the energy storage device according to the device status of the energy storage device; the determination unit 711 is also used to determine the allocable power of the energy storage system based on the dispatchable power, the actual grid power and the actual power consumption of the controllable load; and the control unit 712 is used to allocate a fixed power to the controllable load based on the allocable power, so as to control the controllable load to operate according to the given power consumption.

[0126] In some embodiments, the determining unit 711 is specifically used to: determine the dispatchable power of the energy storage device based on the actual charging power of the energy storage device and the state of charge of the energy storage device when the energy storage device is in a charging state.

[0127] In some embodiments, the determining unit 711 is further configured to: determine the dispatchable power of the energy storage device based on the actual discharge power of the energy storage device and the rated discharge power of the energy storage device when the energy storage device is in a discharge state.

[0128] In some embodiments, after determining the allocatable power of the energy storage system based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, the acquisition unit 710 is further configured to acquire the actual output power and the output power limit of the power conversion device; the calculation unit 713 is configured to calculate the remaining inverter power of the power conversion device based on the output power limit and the actual output power; and the processing unit 714 is configured to perform a limiting process on the allocatable power based on the remaining inverter power to obtain the limited allocatable power.

[0129] In some embodiments, the acquisition unit 710 is further configured to acquire the status information of the loads connected to the energy storage system; the determination unit 711 is further configured to determine the controllable loads from all loads based on the status information.

[0130] In some embodiments, the determining unit 711 is specifically used for: obtaining the desired feeder power; calculating the difference between the actual feeder power and the desired feeder power to obtain the redundant feeder power; and calculating the sum of the dispatchable power, the redundant feeder power, and the actual power consumption to obtain the allocable power.

[0131] In some embodiments, the control unit 712 is specifically configured to: allocate a given power to the corresponding controllable load according to the priority of each controllable load, based on the order of priority from high to low and the rated power of each controllable load, until all the allocable power has been allocated or all controllable loads have participated in the allocation.

[0132] In some embodiments, the determining unit 711 is further configured to determine the charging and discharging power of the energy storage device based on the remaining allocable power when all controllable loads have been allocated and there is remaining allocable power.

[0133] For detailed information on the functions of each module / unit, please refer to the above text. Figure 2 , Figure 5 , Figure 6 The detailed description will not be repeated here.

[0134] Based on the device status of the energy storage equipment, the dispatchable power of the energy storage equipment can be reasonably determined. By combining the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, the allocable power of the energy storage system can be reasonably determined. Using the determined allocable power, a certain amount of power consumption can be allocated to the controllable load. This allows for the allocation of a portion of the charging and discharging power of the energy storage equipment and the actual grid power to the controllable load, attempting to disrupt the balance of household power consumption. In this scenario, if the photovoltaic power generation modules have redundant power generation capacity, they can output more power to maintain the charging and discharging power of the energy storage equipment and the grid power, improving energy utilization. Even if the photovoltaic power generation modules do not have redundant power generation capacity, the allocated power can be fully absorbed by the controllable load without causing energy waste, thereby effectively improving the energy utilization rate of the household energy storage system.

[0135] like Figure 8 The diagram shown is a structural schematic of an energy storage system provided in an embodiment of this application.

[0136] In some embodiments, the energy storage system 100 includes, but is not limited to, a controller 140, a memory 150, and program instructions, such as an energy dispatch program, stored in the memory 150 and executable on the controller 140.

[0137] Those skilled in the art will understand that the schematic diagram is merely an example of the energy storage system 100 and does not constitute a limitation on the energy storage system 100. It may include more or fewer components than shown in the diagram, or combine certain components, or different components. For example, the energy storage system 100 may also include input / output devices, network access devices, buses, etc.

[0138] The controller 140 can be a central processing unit (CPU), or other general-purpose controllers, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose controller can be a microcontroller or any conventional controller. The controller 140 is the computing core and control center of the energy storage system 100, connecting various parts of the entire energy storage system 100 through various interfaces and lines, and executing the operating system of the energy storage system 100 as well as various installed application programs and program code.

[0139] For example, program instructions can be divided into one or more modules / units, one or more of which are stored in memory 150 and executed by controller 140 to complete this application. One or more modules / units can be a series of program instruction segments capable of performing a specific function, which describe the execution process of the program instructions in controller 140. For example, program instructions can be divided into an acquisition unit 710, a determination unit 711, a control unit 712, a calculation unit 713, and a processing unit 714.

[0140] The memory 150 can be used to store program instructions and / or modules. The controller 140 implements various functions by running or executing the program instructions and / or modules stored in the memory 150, and by calling the data stored in the memory 150. The memory 150 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function, etc.; the data storage area may store data created according to the use of the energy storage system, etc. The memory 150 may include non-volatile and volatile memory, such as: hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other storage device.

[0141] The memory 150 can be an external memory and / or an internal memory of the controller 140. Furthermore, the memory 150 can be a physical memory, such as a memory stick, a TF card (Trans-flash Card), etc.

[0142] If the integrated modules / units described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by instructing related hardware through program instructions. The program instructions can be stored in a computer storage medium, and when executed by the controller, the program instructions can implement the steps of the various method embodiments described above.

[0143] Program instructions include program instruction code, which can be in the form of source code, object code, executable file, or some intermediate form. Computer storage media can include: any entity or device capable of carrying program instruction code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), and random access memory (RAM).

[0144] Combination Figure 2 , Figure 5 , Figure 6 The memory 150 in the energy storage system 100 stores program instructions, and the controller 140 can execute the program instructions stored in the memory 150 to implement the energy dispatching method as shown in any of the above method embodiments.

[0145] Specifically, the specific implementation method of the above program instructions by the controller 140 can be found in the description of the relevant steps in the above method embodiment, and will not be repeated here.

[0146] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and other division methods may be used in actual implementation.

[0147] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0148] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0149] Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No appended diagram markings in the claims should be construed as limiting the scope of the claims.

[0150] Furthermore, it is clear that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices can also be implemented by a single unit or device through software or hardware. Terms such as "first," "second," etc., are used to indicate names and do not indicate any specific order.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An energy scheduling method, characterized in that, A controller for use in an energy storage system, the energy storage system including a photovoltaic power generation module, an energy storage device, and a power conversion device; the power conversion device is connected to the photovoltaic power generation module and the energy storage device respectively; the power conversion device is also used to connect to the power grid and a controllable load; the method includes: Obtain the actual feeder power; The dispatchable power of the energy storage device is determined based on the device status of the energy storage device; The allocable power of the energy storage system is determined based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load. Based on the allocable power, a fixed power is allocated to the controllable load to control the controllable load to operate according to the given power.

2. The method as described in claim 1, characterized in that, Determining the dispatchable power of the energy storage device based on its device status includes: When the energy storage device is in a charging state, the dispatchable power of the energy storage device is determined based on the actual charging power of the energy storage device and the state of charge of the energy storage device.

3. The method as described in claim 1, characterized in that, The step of determining the dispatchable power of the energy storage device based on its device status further includes: When the energy storage device is in a discharge state, the dispatchable power of the energy storage device is determined based on the actual discharge power of the energy storage device and the rated discharge power of the energy storage device.

4. The method as described in claim 1, characterized in that, After determining the allocable power of the energy storage system based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load, the method further includes: Obtain the actual output power and output power limit of the power conversion device; Calculate the remaining inverter power of the power conversion device based on the output power limit and the actual output power; The available power is limited based on the remaining inverter power to obtain the limited available power.

5. The method as described in claim 1, characterized in that, The method further includes: Obtain the status information of the loads connected to the energy storage system; Based on the status information, the controllable load is determined from all the loads.

6. The method according to any one of claims 1 to 5, characterized in that, Determining the allocable power of the energy storage system based on the dispatchable power, the actual grid power, and the actual power consumption of the controllable load includes: Obtain the desired feeder power; The difference between the actual feed power and the desired feed power is calculated to obtain the redundant feed power; The sum of the dispatchable power, the redundant feeder power, and the actual power consumption is calculated to obtain the allocable power.

7. The method as described in claim 1, characterized in that, The allocation of constant power to the controllable load based on the allocable power includes: Based on the priority of each controllable load, and according to the order of priority from high to low and the rated power consumption of each controllable load, a corresponding given power consumption is allocated to the corresponding controllable load until all the allocable power has been allocated or all the controllable loads have participated in the allocation.

8. The method as described in claim 7, characterized in that, The method further includes: When all the controllable loads have been allocated and there is remaining allocable power, the charging and discharging power of the energy storage device is determined based on the remaining allocable power.

9. An energy storage system, characterized in that, The energy storage system includes: a photovoltaic power generation module, an energy storage device, a power conversion device, a controller, and a memory; the power conversion device is connected to the photovoltaic power generation module and the energy storage device respectively; the power conversion device is also used to connect to the power grid and controllable loads; The memory is used to store program instructions; and The controller is configured to read and execute the program instructions stored in the memory, and when the program instructions are executed by the controller, the energy storage system performs the energy scheduling method as described in any one of claims 1 to 8.

10. A computer storage medium, characterized in that, The computer storage medium stores program instructions that, when executed on the controller of the energy storage system, cause the energy storage system to perform the energy dispatching method as described in any one of claims 1 to 8.

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