Household photovoltaic integrated energy storage charging and discharging control method, system and equipment

Abstract

The present invention relates to a power control and regulation circuit, and in particular to a household photovoltaic integrated energy storage charge and discharge control method, system, and device. The method includes setting a scheduling storage capacity and calibrating a first scheduling storage mode and a second scheduling storage mode. In the first scheduling storage mode, the scheduling storage capacity performs trickle charging on the energy storage battery. In the second scheduling storage mode, the scheduling storage capacity and the energy storage battery act as loads and perform alternating charging and discharging. The first scheduling storage mode or the second scheduling storage mode is activated according to the state of the energy storage battery. The present invention can perform trickle charging on the energy storage battery by scheduling the storage capacity. When the energy storage system has no load demand for a long time, the attenuation rate of the battery is effectively reduced by the mutual discharge of the energy storage battery and the scheduling battery.

Description

Technical Field

[0001] The present invention relates to a power control and regulation circuit, and in particular to a household photovoltaic integrated energy storage charging and discharging control method, system and equipment. Background Art

[0002] The household photovoltaic integrated energy storage system is a system that integrates photovoltaic power generation, energy storage batteries, inverters, control systems and other functions. It is mainly used for home or small commercial purposes. It can effectively improve the utilization efficiency of solar energy, provide clean energy for households, and reduce electricity bills.

[0003] Trickle charging is a current charging mode for energy storage batteries. After the regular charging phase is complete, a very low current is used to continuously charge the battery, maintaining its charge and preventing loss of power due to self-discharge. Trickle charging allows the battery to remain fully charged even in standby mode, during extended storage, or when not in use for extended periods, thereby replenishing the power lost due to self-discharge.

[0004] However, when there is no external load for a long time, trickle charging will continuously keep the energy storage battery in a fully charged state. The power of the energy storage battery cannot be effectively released, which will accelerate the aging of the battery and the decay of the electrochemical performance. During the decay of the battery, the internal resistance of the battery increases and the maximum voltage value of the battery also decreases accordingly. Therefore, after the constant voltage charging stage in the charging process ends, the target voltage value of trickle charging is constantly changing and decreasing. Therefore, under long-term trickle charging, the battery will accelerate decay and cannot perform normal charge and discharge cycles to maintain the health of the energy storage battery. Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides a household photovoltaic energy storage charge and discharge control method that can effectively perform trickle charging and charge and discharge cycles on energy storage batteries.

[0006] The method comprises the steps of:

[0007] Setting a dispatching storage capacity and calibrating a first dispatching storage mode and a second dispatching storage mode. In the first dispatching storage mode, the dispatching storage capacity performs trickle charging on the energy storage battery. In the second dispatching storage mode, the dispatching storage capacity and the energy storage battery act as loads for alternating charging and discharging.

[0008] charging the energy storage battery and obtaining a first charging reference value of the energy storage battery, and obtaining a second charging reference value of the scheduling storage capacity when the first charging reference value of the energy storage battery reaches a first target value;

[0009] When the second charging reference value is lower than the second target value, charging the energy storage battery and the dispatching storage capacity simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, stopping charging the dispatching storage capacity and obtaining the first charging reference value of the energy storage battery again;

[0010] When the first charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode to trickle charge the energy storage module by scheduling the power storage capacity;

[0011] The load signal of the energy storage battery is obtained. When there is no load signal and the set threshold is reached, the second scheduling storage mode is started. The scheduling storage capacity and the energy storage battery serve as loads for alternating charging and discharging.

[0012] Due to the adoption of the above method, through the two-level scheduling storage mode, first, the scheduling storage capacity can be used to trickle charge the energy storage battery, keeping the energy storage battery fully charged when the energy storage battery is working normally; secondly, when the energy storage system has no load demand for a long time, the mutual discharge of the energy storage battery and the scheduling battery and the energy consumption during the mutual discharge naturally complete the charge and discharge cycle, maintain the electrochemical activity of the energy storage battery and the scheduling battery, and effectively reduce the battery attenuation rate.

[0013] In a possible implementation, setting the scheduling storage capacity includes:

[0014] A dispatching power storage unit is provided, and the dispatching power storage unit is connected to the energy storage system.

[0015] In a possible implementation, setting the scheduling storage capacity includes:

[0016] The energy storage unit and the dispatching unit are calibrated, wherein the energy storage unit serves as an energy storage battery and the dispatching unit serves as a dispatching storage capacity.

[0017] In a possible implementation, setting the scheduling storage capacity includes:

[0018] The energy storage unit and the hybrid unit are calibrated, and the energy storage interval and the scheduling interval are calibrated in the hybrid unit. The energy storage unit and the energy storage interval serve as energy storage batteries, and the scheduling interval serves as a scheduling storage capacity.

[0019] In a second aspect, an embodiment of the present application further provides a household photovoltaic integrated energy storage and charging and discharging system, the system comprising:

[0020] Energy storage batteries, used to store and provide electrical energy;

[0021] A battery management module is connected to the energy storage battery and is used to monitor the status of the energy storage battery, manage the charging and discharging of the energy storage battery, and control the temperature;

[0022] Photovoltaic modules, which convert light energy into DC electricity;

[0023] An inverter module, connected to the photovoltaic module and the energy storage battery, for converting DC power on the DC bus side and converting AC and DC power between the DC bus side and the AC bus side;

[0024] The battery management module sets a scheduling storage capacity and calibrates a first scheduling storage mode and a second scheduling storage mode. In the first scheduling storage mode, the scheduling storage capacity performs trickle charging on the energy storage battery. In the second scheduling storage mode, the scheduling storage capacity and the energy storage battery act as loads and perform alternating charging and discharging.

[0025] monitoring a first charging reference value of the energy storage battery when the energy storage battery is being charged, and obtaining a second charging reference value of the scheduling storage capacity when the first charging reference value of the energy storage battery reaches a first target value;

[0026] When the second charging reference value is lower than the second target value, charging the energy storage battery and the dispatching storage capacity simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, stopping charging the dispatching storage capacity and obtaining the second charging reference value of the energy storage battery;

[0027] When the second charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode to trickle charge the energy storage battery by scheduling the power storage capacity;

[0028] The load signal of the energy storage battery is obtained. When there is no load signal and the set threshold is reached, the second scheduling storage mode is started. The scheduling storage capacity and the energy storage battery serve as loads for alternating charging and discharging.

[0029] In one possible implementation,

[0030] The dispatching electricity storage capacity includes a dispatching electricity storage unit;

[0031] The battery management module includes a scheduling control unit;

[0032] The dispatching control unit is connected to and controls the dispatching power storage unit.

[0033] In one possible implementation,

[0034] The energy storage battery includes an energy storage unit and a scheduling unit;

[0035] The battery management module includes a calibration unit, an energy storage management unit and a scheduling management unit;

[0036] The calibration unit is connected to the energy storage unit and the scheduling unit to perform unit calibration;

[0037] The energy storage management unit is connected to and controls the energy storage battery, and the scheduling management unit is connected to and controls the scheduling unit;

[0038] The scheduling unit constitutes the scheduling electricity storage capacity.

[0039] In one possible implementation,

[0040] The energy storage battery includes an energy storage unit and a hybrid unit;

[0041] The hybrid unit includes an energy storage interval and a scheduling interval;

[0042] The battery management module includes a unit calibration unit, an interval calibration unit, an energy storage management unit and a scheduling management unit;

[0043] The unit calibration unit is connected to and calibrates the energy storage unit and the hybrid unit;

[0044] The interval calibration unit is connected to the hybrid unit and calibrates the energy storage interval and the scheduling interval;

[0045] The energy storage management unit connects and controls the energy storage unit and the energy storage interval;

[0046] The scheduling management unit is connected to and controls the scheduling interval.

[0047] In a possible implementation, the energy storage interval and the scheduling interval are divided according to battery cells.

[0048] In a third aspect, an embodiment of the present application further provides a photovoltaic integrated energy storage device, which includes the system described in the second aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of the first embodiment;

[0050] Figure 2 This is a schematic diagram of the module structure of the second embodiment;

[0051] Figure 3 This is a schematic diagram of the module structure of the third embodiment;

[0052] Figure 4 Schematic diagram of the module structure of the fourth embodiment. DETAILED DESCRIPTION

[0053] The following is a further detailed description of the present invention in conjunction with specific embodiments and accompanying drawings. Obviously, the embodiments described are only a portion of the embodiments, not all of the embodiments. Based on the following embodiments, all other embodiments proposed by ordinary technicians in this field without creative work are also within the scope of protection of the present invention.

[0054] It should be understood that the controllers and control circuits involved in the embodiments are conventional control technologies or units for those skilled in the art. For example, the control circuit of the controller can be implemented by ordinary technicians in this field using existing technologies.

[0055] The disclosure of the embodiments provides many different implementations or examples for implementing different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described in the embodiments. Of course, they are merely examples and are not intended to limit the present invention. In addition, reference numerals and / or reference letters may be repeated in different examples in the embodiments. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed. In addition, if examples of various specific processes and materials are provided in the embodiments, those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0056] The first embodiment of the present application provides a household photovoltaic integrated energy storage charging and discharging control method.

[0057] The method comprises the steps of:

[0058] S1. Set the scheduling storage capacity and calibrate the first scheduling storage mode and the second scheduling storage mode. In the first scheduling storage mode, the scheduling storage capacity trickle charges the energy storage battery. In the second scheduling storage mode, the scheduling storage capacity and the energy storage battery act as loads for alternating charge and discharge.

[0059] S2. Charging the energy storage battery and obtaining a first charging reference value of the energy storage battery. When the first charging reference value of the energy storage battery reaches a first target value, obtaining a second charging reference value of the scheduling storage capacity;

[0060] S3. When the second charging reference value is lower than the second target value, the energy storage battery and the dispatch storage capacity are charged simultaneously, so that the second charging reference value of the dispatch storage capacity reaches the second target value, the charging of the dispatch storage capacity is stopped, and the first charging reference value of the energy storage battery is obtained again;

[0061] S4. When the first charging reference value of the energy storage battery reaches a third target value, the first scheduling storage mode is started, and the energy storage module is trickle charged by scheduling the storage capacity;

[0062] S5. Obtain the load signal of the energy storage battery. When there is no load signal and the load signal reaches a set threshold, start the second scheduling storage mode. The scheduling storage capacity and the energy storage battery act as loads for alternating charging and discharging.

[0063] To facilitate understanding of the practical content and functions of each of the above steps, let's first use a common photovoltaic energy storage system as an example. A photovoltaic energy storage system generally includes photovoltaic modules, energy storage batteries, a battery management module, and an inverter module. The photovoltaic modules and energy storage batteries are located at the DC bus terminal. The photovoltaic modules, commonly known as photovoltaic panels or solar panels, convert light energy, typically sunlight, into DC power. The energy storage batteries store power generated by the photovoltaic modules or power input from the power grid. The battery management module electronically controls and manages the battery status and charging and discharging. The inverter module, also known as an inverter, typically includes off-grid and grid-connected inverters. It connects the DC bus terminal and the AC bus terminal. Its primary function is to perform DC-DC conversion on the DC bus terminal and DC-AC conversion between the DC bus terminal and the AC bus terminal. The DC-DC conversion of the power generated by the photovoltaic modules is stored in the energy storage battery. Furthermore, the power generated by the photovoltaic modules or stored in the energy storage modules is converted into AC power, which can be used to replace or supplement the power grid to supply household electricity.

[0064] This embodiment primarily solves the problem that the existing photovoltaic energy storage system, while achieving trickle charging to supplement the self-consumption of the energy storage module, is unable to perform charge and discharge cycles when there is no load for a long time, causing attenuation.

[0065] To solve this problem, in step S1 of this embodiment, step S1 mainly performs two settings. The first part is set to set the scheduling storage capacity. The scheduling storage capacity is the storage capacity isolated from the energy storage battery capacity in the energy storage system. The scheduling storage capacity does not participate in the storage of photovoltaic power generation, nor does it participate in the discharge to the load. The second part is set to calibrate the first scheduling storage mode and the second scheduling storage mode. In the first scheduling storage mode, the scheduling storage capacity trickle charges the energy storage battery. In the second scheduling storage mode, the scheduling storage capacity and the energy storage battery act as loads for alternating charging and discharging. The calibration of the first scheduling storage mode and the second scheduling storage mode mainly has two functions. First, the scheduling storage capacity can use its own electricity as a power source to trickle charge the energy storage battery. Second, when the energy storage system is long-term loaded or unloaded, the charging and discharging process of the energy storage module is realized by mutual charging and discharging of the energy storage battery and the scheduling storage capacity, combined with the natural power loss during the charging and discharging process, to maintain its electrochemical activity and delay attenuation.

[0066] Since the dispatching storage unit is only used as a trickle charge and cyclic load, and participates in the working process of the energy storage system when needed, its working state needs to be combined with the charging and discharging of the energy storage battery. The following introduces the charging and discharging of conventional energy storage batteries.

[0067] Step S2 is the beginning stage of charging the energy storage battery, charging the energy storage system from photovoltaic or grid power, monitoring a first charging reference value of the energy storage battery during charging, and obtaining a second charging reference value of the dispatched storage capacity when the first charging reference value of the energy storage battery reaches a first target value;

[0068] In this embodiment, the above-mentioned charging reference values ​​are described by taking the existing constant current charging to constant voltage charging mode as an example.

[0069] Common charging modes or stages include constant current charging, constant voltage charging, and trickle charging.

[0070] Among them, the constant current charging stage is the initial stage of battery charging. At this time, the battery voltage is low and the system charges the battery through a constant current.

[0071] During the charging process, the battery voltage gradually rises, and the battery's charge acceptance capacity decreases as the voltage increases. Therefore, in this stage, the charging current remains constant until the battery voltage reaches the set charging voltage upper limit.

[0072] During the constant current charging phase, the photovoltaic power generation system or charging controller sets a constant current based on the battery type, capacity, and charging characteristics. For example, for lithium batteries, the constant current charging current is typically 0.2C-0.5C (C is the battery capacity) of the battery's rated capacity, meaning the battery's charging current is 20%-50% of the battery's rated capacity. During this process, the battery voltage rises, and chemical reactions and charge transfer within the battery begin. However, due to the low battery voltage, the electrolyte and plates within the battery are in a relatively stable state, allowing constant current charging to charge the battery quickly and efficiently. Therefore, in this embodiment, the first charging reference value is the charging voltage of the energy storage battery, and the first target reference value can be the voltage value when the battery is charged to 50% of the rated voltage. At this point, it is necessary to obtain a second charging reference value for the scheduled storage capacity, which can also be the voltage of the scheduled storage capacity.

[0073] Since the dispatching storage capacity in this embodiment is only used as trickle charging and cyclic load, its own capacity and actual retained power demand are not large and can be flexibly replenished and consumed. Therefore, the dispatching storage capacity does not need to be fast charged during the constant current charging stage. Although fast charging can quickly replenish power, its heat generation and battery loss also increase accordingly, which has no practical significance for the application of the dispatching storage capacity. Therefore, in step S3 of this embodiment, when the second charging reference value is lower than the second target value, the energy storage battery and the dispatching storage capacity are charged simultaneously. After the second charging reference value of the dispatching storage capacity reaches the second target value, charging of the dispatching storage capacity is stopped and the first charging reference value of the energy storage battery is obtained again; the second target value here can also be the voltage value of the dispatching storage capacity. The power of the dispatching storage capacity corresponding to the voltage value needs to be able to maintain trickle charging of the energy storage battery. Generally, by configuring the size of the dispatching charging capacity, the margin corresponding to the second target value of the dispatching charging capacity can be maintained at 50%. If it is lower than 50%, it is necessary to charge to this level and then stop charging.

[0074] Furthermore, in step S4, when the first charging reference value of the energy storage battery reaches a third target value, the first scheduling power storage mode is started to trickle charge the energy storage module by scheduling the power storage capacity;

[0075] During the constant voltage charging stage, the charging current of the energy storage battery gradually decreases, and the charging system maintains the battery voltage at a fixed value. The purpose of the constant voltage charging stage is to ensure that the battery voltage does not exceed its rated value to prevent overcharging.

[0076] During this phase, the charging current gradually decreases until it reaches a preset threshold (e.g., 0.05C), at which point the charging process ends. Once the battery voltage approaches the rated voltage, the charging system adjusts the charging current to maintain the battery voltage at the set voltage, which is the third target value. Reaching the third target value completes the constant-voltage charging phase, which is designed to prevent overcharging and damage. This phase is particularly important for lithium and lead-acid batteries.

[0077] The maximum charge voltage of a battery is determined by its chemical composition and design characteristics, and is directly related to its safety, lifespan, and performance. Different battery types have different maximum charge voltage standards, which are usually specified based on the battery's electrochemical reactions and material properties. Below are the maximum charge voltages and related parameters for several common battery types:

[0078] 1. Lithium battery (Li-ion)

[0079] Maximum charge voltage: Typically 4.2V per cell (i.e., per battery unit). 4.2V is the common maximum safe charging voltage for lithium batteries, representing the maximum voltage at which the battery materials can operate stably. Exceeding this voltage can lead to dangerous conditions such as lithium metal precipitation, thermal runaway, or battery expansion.

[0080] 2. Lithium iron phosphate battery (LiFePO4)

[0081] Maximum charge voltage: Typically 3.65V per cell. The chemical structure of LiFePO4 batteries is more stable than traditional lithium batteries. Their lower maximum charge voltage (3.65V) is intended to prevent the risks of overheating or overcharging, while also ensuring a longer battery life.

[0082] It should be noted that after the charging target voltage in the constant voltage charging stage reaches the third target value, the battery is considered to be fully charged, that is, full or 100% in the display state in the energy storage system.

[0083] However, the actual battery capacity is still slightly lower than the actual full charge. In some complete charging solutions, this capacity gap is usually filled by trickle charging.

[0084] The trickle charge stage is the final stage of battery charging. Its primary purpose is to continuously supply charge to the battery through a very low current after it is fully charged, maintaining its charge state and preventing loss of charge due to self-discharge. The charging current in this stage is very low and is typically initiated after the battery is fully charged. The trickle charge current is generally less than 0.05C of the battery's rated capacity. Trickle charging allows the battery to maintain a full charge even during extended periods of inactivity, thereby preventing loss of charge due to excessive self-discharge. However, prolonged trickle charging can still cause overcharging, a major cause of battery degradation.

[0085] As the battery ages, its internal resistance increases and the chemical reaction efficiency decreases. These changes will cause the battery's output voltage to drop, as shown in the following:

[0086] Charging voltage drop: A degraded battery may not be able to reach the designed charging voltage. For example, the maximum charging voltage of a lithium battery may drop, making it impossible for the charger to fully charge the battery to its normal voltage value.

[0087] Discharge voltage drop: The battery's discharge voltage also drops. As the battery degrades, the rate of voltage drop during discharge accelerates. For example, the battery may reach the low voltage warning level earlier during discharge, causing the device to shut down prematurely.

[0088] Battery capacity reduction: A degraded battery typically loses some of its original capacity, so under the same load conditions, the battery voltage may drop to an unsafe level in a shorter period of time.

[0089] Therefore, in step S4 of this embodiment, the first scheduling storage mode is started, and the energy storage module is trickle-charged by scheduling the storage capacity. Compared with trickle charging the energy storage battery through the photovoltaic module, charging the energy storage battery through scheduling the storage capacity can prevent the trickle charging from being interrupted by sunlight, and the working curve is more stable and the extension time is longer. Compared with trickle charging after the AC power is converted to DC through the inverter, the energy conversion ratio of the electric energy is small, the load on the inverter circuit is small, and the overall heat generation of the system is greatly reduced.

[0090] The combination of these charging stages facilitates rapid charging when the battery is low on charge, while also ensuring safe and efficient charging and extending the battery's lifespan. The current and voltage control strategies used in these different stages are designed to adapt to the battery's varying charging requirements and avoid problems like overcharging and over-discharging.

[0091] In addition, step S5 obtains the load signal of the energy storage battery. When there is no load signal and the set threshold is reached, the second scheduled storage mode is activated. The scheduled storage capacity and the energy storage module act as loads, and alternating charge and discharge are performed. Step S5 is primarily used to address the problem of the energy storage battery remaining fully charged for a long period of time when it is unloaded and in trickle charge mode, unable to effectively cycle charge and discharge, and thus decaying. The overall set threshold for this step is a time threshold, which can be set to 10 days in this embodiment.

[0092] After adopting the above method, first, the dispatching storage capacity can be used to trickle charge the energy storage battery, keeping the energy storage battery fully charged when the energy storage battery is working normally. Secondly, when the energy storage system has no load demand for a long time, the mutual discharge of the energy storage battery and the dispatching battery and the energy consumption during the mutual discharge can naturally complete the charge and discharge cycle, maintain the electrochemical activity of the energy storage battery and the dispatching battery, and effectively reduce the battery attenuation rate.

[0093] In this embodiment, there are several ways to set the scheduling storage capacity:

[0094] In the first method, the setting of the dispatching storage capacity includes:

[0095] Setting up a dispatching power storage unit and connecting the dispatching power storage unit to the energy storage system;

[0096] In this mode, the dispatching battery is an additional battery accessory that is connected to the DC bus terminal of the energy storage system, so that it can be charged and discharged with the energy storage battery after the DC-DC conversion of the inverter.

[0097] In the second method, the setting of the dispatching storage capacity includes:

[0098] The energy storage unit and the dispatching unit are calibrated, wherein the energy storage unit serves as an energy storage battery and the dispatching unit serves as a dispatching storage capacity.

[0099] In this approach, the energy storage system's batteries are composed of multiple single cells, such as stacked battery modules. When the energy storage batteries are stacked, some of the cells can be used as energy storage batteries, while others can be used as dispatching storage capacity. In this case, no external battery is required. The battery pack can be calibrated in the charging management module's software. For example, if a stacked battery system has five cells, four of them can be calibrated as energy storage units BU1-BU4, and the remaining cell can be calibrated as dispatching unit DU1. Energy storage units BU1-BU4 function as energy storage batteries, storing and discharging electricity in the energy storage system. Dispatching unit DU1 and energy storage units BU1-BU4 are mutually charged and discharged via the DC bus, but are not externally charged or discharged.

[0100] In a possible implementation, setting the scheduling storage capacity includes:

[0101] The energy storage unit and the hybrid unit are calibrated, and the energy storage interval and the scheduling interval are calibrated in the hybrid unit. The energy storage unit and the energy storage interval serve as energy storage batteries, and the scheduling interval serves as a scheduling storage capacity.

[0102] In this mode, the energy storage battery is a battery pack composed of multiple single cells, and each single cell is composed of multiple cell groups connected in parallel. Taking a stacked battery with five batteries as an example, four of the batteries are calibrated as energy storage interval B through the software of the charging management module, and the remaining battery is calibrated as a mixed unit H. Furthermore, the mixed unit H includes 10 cell groups B1-B10, of which B1-B5 are calibrated as energy storage intervals, and BX6-BX10 are calibrated as scheduling interval D. When working, the energy storage interval B and the energy storage interval B1-B5 are used as energy storage batteries, and the scheduling interval D is used as the scheduling storage capacity.

[0103] like Figure 2 As shown, the second embodiment of the present application further provides a household photovoltaic integrated energy storage and charging and discharging system, which includes:

[0104] Energy storage battery 1, used to store and provide electrical energy;

[0105] A battery management module 2 is connected to the energy storage battery and is used to monitor the state of the energy storage battery, manage the charging and discharging of the energy storage battery, and control the temperature; the battery management module 2 includes a scheduling control unit 21;

[0106] Photovoltaic module 3, used to convert light energy into DC electrical energy;

[0107] The inverter module 4 is connected to the photovoltaic module and the energy storage battery, and is used for DC power conversion on the DC bus side and AC / DC power conversion between the DC bus side and the AC bus side;

[0108] The dispatching power storage unit 5 , the dispatching control unit 21 is connected to and controls the dispatching power storage unit 5 .

[0109] The battery management module 2 calibrates a first scheduling power storage mode and a second scheduling power storage mode. In the first scheduling power storage mode, the scheduling power storage unit 5 performs trickle charging on the energy storage battery. In the second scheduling power storage mode, the scheduling power storage unit 5 and the energy storage battery 1 act as loads for alternating charging and discharging.

[0110] monitoring a first charging reference value of the energy storage battery 1 when the energy storage battery 1 is being charged, and obtaining a second charging reference value of the scheduling power storage unit 5 when the first charging reference value of the energy storage battery 1 reaches a first target value;

[0111] When the second charging reference value is lower than the second target value, the energy storage battery 1 and the dispatching power storage unit 5 are charged simultaneously. After the second charging reference value of the dispatching power storage unit 5 reaches the second target value, the charging of the dispatching power storage unit 5 is stopped, and the second charging reference value of the energy storage battery 1 is obtained;

[0112] When the second charging reference value of the energy storage battery 1 reaches a third target value, the first scheduling power storage mode is started, and the energy storage battery 1 is trickle charged by the scheduling power storage unit 5;

[0113] The load signal of the energy storage battery 1 is obtained. When there is no load signal and the set threshold is reached, the second scheduling power storage mode is started. The scheduling power storage unit 5 and the energy storage battery 1 act as loads for alternating charging and discharging.

[0114] like Figure 3 As shown, the third embodiment of the present application further proposes a household photovoltaic energy storage charging and discharging system based on the second embodiment. In this system, the energy storage battery 1 includes an energy storage unit 11 and a scheduling unit 12; the battery management module 2 includes a calibration unit 22, an energy storage management unit 23, and a scheduling management unit 24; the calibration unit 22 connects the energy storage unit 11 and the scheduling unit 12 for unit calibration; the energy storage management unit 23 connects to and controls the energy storage unit 11, and the scheduling management unit 24 connects to and controls the scheduling unit 12. During operation, the energy storage unit 11 is equivalent to the energy storage battery 1 in the second embodiment; the scheduling unit 12 is equivalent to the scheduling storage unit 5 in the second embodiment.

[0115] like Figure 4 As shown, the fourth embodiment of the present application further proposes a household photovoltaic energy storage charging and discharging system based on the second embodiment, in which the energy storage battery 1 includes an energy storage unit 13 and a hybrid unit 14; the hybrid unit 14 includes an energy storage interval 141 and a scheduling interval 142; the battery management module 2 includes a unit calibration unit 25, an interval calibration unit 26, an energy storage management unit 27, and a scheduling management unit 28; the unit calibration unit 25 connects and calibrates the energy storage unit 13 and the hybrid unit 14; the interval calibration unit 26 connects the hybrid unit 14 and calibrates the energy storage interval 141 and the scheduling interval 142; the energy storage management unit 27 connects and controls the energy storage unit 13 and the energy storage interval 141; and the scheduling management unit 28 connects and controls the scheduling interval 142. During operation, the combination of the energy storage unit 13 and the energy storage interval 141 is equivalent to the energy storage battery 1 in the second embodiment; and the scheduling interval 142 is equivalent to the scheduling storage unit 5 in the second embodiment.

[0116] Preferably, in the fourth embodiment, the energy storage interval and the scheduling interval are divided according to battery cells.

[0117] The fifth embodiment of the present application further provides a photovoltaic integrated energy storage device, which includes the system described in the second to fourth embodiments above.

[0118] The above description is only a preferred embodiment of the embodiments of the present application, and does not limit the scope of disclosure of the embodiments of the present application. Any equivalent structure or equivalent process transformation made using the embodiment description and drawings of the present application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection supported by the embodiments of the present application.

Claims

1. A household photovoltaic integrated energy storage charging and discharging control method, characterized in that: Including steps: Setting a dispatching storage capacity and calibrating a first dispatching storage mode and a second dispatching storage mode. In the first dispatching storage mode, the dispatching storage capacity performs trickle charging on the energy storage battery. In the second dispatching storage mode, the dispatching storage capacity and the energy storage battery act as loads for alternating charging and discharging. charging the energy storage battery and obtaining a first charging reference value of the energy storage battery, and obtaining a second charging reference value of the scheduling storage capacity when the first charging reference value of the energy storage battery reaches a first target value; When the second charging reference value is lower than the second target value, charging the energy storage battery and the dispatching storage capacity simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, stopping charging the dispatching storage capacity and obtaining the first charging reference value of the energy storage battery again; When the first charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode to trickle charge the energy storage battery by scheduling the power storage capacity; The load signal of the energy storage battery is obtained. When there is no load signal and the set threshold is reached, the second scheduling storage mode is started. The scheduling storage capacity and the energy storage battery serve as loads for alternating charging and discharging.

2. The household photovoltaic integrated energy storage charging and discharging control method according to claim 1, characterized in that: The setting of the dispatching storage capacity includes: A dispatching power storage unit is provided, and the dispatching power storage unit is connected to the energy storage system.

3. The household photovoltaic integrated energy storage charging and discharging control method according to claim 1, characterized in that: The setting of the dispatching storage capacity includes: The energy storage unit and the dispatching unit are calibrated, wherein the energy storage unit serves as an energy storage battery and the dispatching unit serves as a dispatching storage capacity.

4. The household photovoltaic integrated energy storage charging and discharging control method according to claim 1, characterized in that: The setting of the dispatching storage capacity includes: The energy storage unit and the hybrid unit are calibrated, and the energy storage interval and the scheduling interval are calibrated in the hybrid unit. The energy storage unit and the energy storage interval serve as energy storage batteries, and the scheduling interval serves as a scheduling storage capacity.

5. Household photovoltaic integrated energy storage and discharging system, characterized by: The system includes: Energy storage batteries, used to store and provide electrical energy; A battery management module is connected to the energy storage battery and is used to monitor the status of the energy storage battery, manage the charging and discharging of the energy storage battery, and control the temperature; Photovoltaic modules, which convert light energy into DC electricity; An inverter module, connected to the photovoltaic module and the energy storage battery, for converting DC power on the DC bus side and converting AC and DC power between the DC bus side and the AC bus side; The battery management module sets a scheduling storage capacity and calibrates a first scheduling storage mode and a second scheduling storage mode. In the first scheduling storage mode, the scheduling storage capacity performs trickle charging on the energy storage battery. In the second scheduling storage mode, the scheduling storage capacity and the energy storage battery act as loads and perform alternating charging and discharging. monitoring a first charging reference value of the energy storage battery when the energy storage battery is being charged, and obtaining a second charging reference value of the scheduling storage capacity when the first charging reference value of the energy storage battery reaches a first target value; When the second charging reference value is lower than the second target value, charging the energy storage battery and the dispatching storage capacity simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, stopping charging the dispatching storage capacity and obtaining the second charging reference value of the energy storage battery; When the second charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode to trickle charge the energy storage battery by scheduling the power storage capacity; The load signal of the energy storage battery is obtained. When there is no load signal and the set threshold is reached, the second scheduling storage mode is started. The scheduling storage capacity and the energy storage battery serve as loads for alternating charging and discharging.

6. The household photovoltaic integrated energy storage and discharging system according to claim 5, characterized in that: The scheduling power storage capacity includes a scheduling power storage unit, and the battery management module includes a scheduling control unit. The scheduling control unit is connected to and controls the scheduling power storage unit.

7. The household photovoltaic integrated energy storage and discharging system according to claim 5, characterized in that: The energy storage battery includes an energy storage unit and a scheduling unit; The battery management module includes a calibration unit, an energy storage management unit and a scheduling management unit, wherein the calibration unit is connected to the energy storage unit and the scheduling unit to perform unit calibration; The energy storage management unit is connected to and controls the energy storage battery, and the scheduling management unit is connected to and controls the scheduling unit.

8. The household photovoltaic integrated energy storage and discharging system according to claim 5, characterized in that: The energy storage battery includes an energy storage unit and a hybrid unit; The hybrid unit includes an energy storage interval and a scheduling interval; The battery management module includes a unit calibration unit, an interval calibration unit, an energy storage management unit and a scheduling management unit; The unit calibration unit is connected to and calibrates the energy storage unit and the hybrid unit; The interval calibration unit is connected to the hybrid unit and calibrates the energy storage interval and the scheduling interval; The energy storage management unit connects and controls the energy storage unit and the energy storage interval; The scheduling management unit is connected to and controls the scheduling interval.

9. The household photovoltaic integrated energy storage and discharging system according to claim 8, characterized in that: The energy storage interval and scheduling interval are divided according to battery cells.

10. A photovoltaic integrated energy storage device, characterized in that: A system comprising any one of claims 5-9.

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