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

Abstract

The invention relates to a power control and regulation circuit, in particular to a household photovoltaic integrated energy storage charging and discharging control method, system and equipment. Comprising the following steps: setting dispatching electricity storage capacity and calibrating a first dispatching electricity storage mode and a second dispatching electricity storage mode, in the first dispatching electricity storage mode, trickle charging is performed on an energy storage battery by the dispatching electricity storage capacity, and in the second dispatching electricity storage mode, the dispatching electricity storage capacity and the energy storage battery serve as loads mutually. Alternate charging and discharging are carried out; and starting a first scheduling power storage mode or a second scheduling power storage mode according to the state of the energy storage battery. According to the invention, trickle charging can be carried out on the energy storage battery by scheduling the electricity storage capacity, and the attenuation speed of the battery is effectively reduced through mutual discharging of the energy storage battery and the scheduling battery under the condition that the energy storage system has no load demand for a long time.

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 families, and reduce electricity bills.

[0003] Trickle charging is one of the existing charging modes for energy storage batteries. Usually, after the normal charging stage of the energy storage battery is completed, a very small current is used to continuously provide charge to the battery to maintain the battery's charging state and prevent the battery from losing power due to self-discharge. Through trickle charging, the battery can still be fully charged in standby mode or when stored or not used for a long time, so as to supplement the power loss caused by self-discharge of the energy storage battery.

[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 the trickle charging enters a constantly changing and decreasing state. Therefore, under long-term trickle charging, the battery will decay faster 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: Setting a dispatching power storage capacity and calibrating a first dispatching power storage mode and a second dispatching power storage mode, wherein in the first dispatching power storage mode, the dispatching power storage capacity performs trickle charging on the energy storage battery, and in the second dispatching power storage mode, the dispatching power storage capacity and the energy storage battery act as loads for alternate charging and discharging; Charging the energy storage battery and obtaining a first charging reference value of the energy storage battery, and 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 power storage capacity; 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, and after the second charging reference value of the dispatching storage capacity reaches the second target value, the charging of the dispatching storage capacity is stopped, and the first charging reference value of the energy storage battery is obtained again; When the first charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode, and performing trickle charging on the energy storage module by scheduling the power storage capacity; The load signal of the energy storage battery is obtained, and when there is no load signal and the set threshold is reached, the second scheduling power storage mode is started, and the scheduling power storage capacity and the energy storage battery serve as loads for alternate charging and discharging.

[0007] Due to the adoption of the above method, through the two-level scheduling power storage mode, firstly, the scheduling power storage capacity can perform trickle charging on the energy storage battery, and keep the energy storage battery in a fully charged state 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 can 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.

[0008] In a possible implementation, setting the scheduling power storage capacity includes: A dispatching power storage unit is provided, and the dispatching power storage unit is connected to the energy storage system.

[0009] In a possible implementation, setting the dispatching power 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.

[0010] In a possible implementation, setting the dispatching power storage capacity includes: The energy storage unit and the hybrid unit are calibrated, and the energy storage interval and the dispatching interval are calibrated in the hybrid unit. The energy storage unit and the energy storage interval serve as energy storage batteries, and the dispatching interval serves as a dispatching storage capacity.

[0011] In a second aspect, an embodiment of the present application further provides a household photovoltaic integrated energy storage charging and discharging system, the system comprising: Energy storage batteries, used to store and provide electrical energy; A battery management module, connected to the energy storage battery, for monitoring the state of the energy storage battery, managing the charging and discharging of the energy storage battery and temperature control; 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 the dispatching power storage capacity and calibrates the first dispatching power storage mode and the second dispatching power storage mode. In the first dispatching power storage mode, the dispatching power storage capacity performs trickle charging on the energy storage battery. In the second dispatching power storage mode, the dispatching power storage capacity and the energy storage battery act as loads for alternate charging and discharging. monitoring a first charging reference value of the energy storage battery when the energy storage battery is charged, and acquiring a second charging reference value of the scheduling power 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, the energy storage battery and the dispatching storage capacity are charged simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, the charging of the dispatching storage capacity is stopped, and the second charging reference value of the energy storage battery is obtained; When the second charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode, and performing trickle charging on the energy storage battery by scheduling the power storage capacity; The load signal of the energy storage battery is obtained, and when there is no load signal and the set threshold is reached, the second scheduling power storage mode is started, and the scheduling power storage capacity and the energy storage battery serve as loads for alternate charging and discharging.

[0012] In one possible implementation, The dispatching power storage capacity includes a dispatching power storage unit; The battery management module includes a scheduling control unit; The dispatching control unit is connected to and controls the dispatching power storage unit.

[0013] In one possible implementation, 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; 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; The scheduling unit constitutes the scheduling power storage capacity.

[0014] In one possible implementation, 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.

[0015] In a possible implementation, the energy storage interval and the scheduling interval are divided according to battery cells.

[0016] 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

[0017] Figure 1 is a flow chart of the first embodiment; Figure 2 It is a schematic diagram of the module structure of the second embodiment; Figure 3 is a schematic diagram of the module structure of the third embodiment; Figure 4 FIG. 4 is a schematic diagram of the module structure of the fourth embodiment. DETAILED DESCRIPTION

[0018] The following is a further detailed description in conjunction with specific embodiments and drawings. Obviously, the described embodiments are only a part 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 also fall within the scope of protection of the present invention.

[0019] It should be understood that the controllers and control circuits involved in the embodiments are conventional control technologies or units of those skilled in the art. For example, the control circuit of the controller can be implemented by ordinary technicians in the field using existing technologies.

[0020] The disclosure of the embodiments provides many different implementations or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described in the embodiments. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, reference numerals and / or reference letters can be repeated in different examples in the embodiments, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various implementations and / or settings discussed. In addition, if various specific examples of processes and materials are provided in the embodiments, those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0021] The first embodiment of the present application provides a household photovoltaic integrated energy storage charging and discharging control method.

[0022] The method comprises the steps of: S1. Set the dispatching storage capacity and calibrate the first dispatching storage mode and the 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. S2. charging the energy storage battery and obtaining a first charging reference value of the energy storage battery, and 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; S3. When the second charging reference value is lower than the second target value, the energy storage battery and the dispatching storage capacity are charged at the same time, so that after the second charging reference value of the dispatching storage capacity reaches the second target value, the charging of the dispatching storage capacity is stopped, and the first charging reference value of the energy storage battery is obtained again; S4. When the first charging reference value of the energy storage battery reaches the third target value, the first scheduling power storage mode is started to trickle charge the energy storage module by scheduling the power storage capacity; S5. Obtain the load signal of the energy storage battery, and when there is no load signal and the set threshold is reached, start the second scheduling power storage mode, and the scheduling power storage capacity and the energy storage battery act as loads for alternate charging and discharging.

[0023] In order to facilitate understanding of the actual content and function of each of the above steps, first take a common photovoltaic energy storage system as an example. The photovoltaic energy storage system generally includes photovoltaic modules, energy storage batteries, battery management modules, and inverter modules. Among them, the photovoltaic module and the energy storage battery are located at the DC bus end. The photovoltaic module is what is commonly called a photovoltaic panel or solar panel. The photovoltaic module converts light energy, usually sunlight, into DC power. The energy storage battery stores the power generated by the photovoltaic module or the power converted and input by the power grid. The battery management module performs electronic control and management of the battery state and the charging and discharging of the battery. The inverter module is an inverter, which usually includes an off-grid inverter and a grid-connected inverter, which is used to connect the DC bus end and the AC bus end. Its main function is to perform DC-DC conversion at the DC bus end and mutual DC-AC conversion between the DC bus end and the AC bus end, store the power generated by the photovoltaic module in the energy storage battery after DC-DC conversion, and convert the power generated by the photovoltaic module or the power stored in the energy storage module into AC power to replace or supplement the power grid to supply household electricity.

[0024] This embodiment primarily solves the problem that, while the existing photovoltaic energy storage system realizes trickle charging to supplement the self-consumption of the energy storage module, the energy storage module cannot perform the charge and discharge cycle when there is no load for a long time, causing attenuation.

[0025] In order to solve this problem, in step S1 of this embodiment, step S1 mainly performs two settings. The first part is set to set the dispatching storage capacity. The dispatching storage capacity is the storage capacity isolated from the energy storage battery capacity in the energy storage system. The dispatching storage capacity does not participate in the storage of photovoltaic power generation, and does not participate in the external discharge of the load; the second part is set to calibrate the first dispatching storage mode and the 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. The calibration of the first dispatching storage mode and the second dispatching storage mode mainly has two functions. First, the dispatching storage capacity can use its own electricity as a power source to perform trickle charging on the energy storage battery. Second, when the energy storage system is under long-term load and no load, the charging and discharging process of the energy storage module is realized by mutual charging and discharging of the energy storage battery and the dispatching storage capacity, combined with the natural power loss during the charging and discharging process, to maintain its electrochemical activity and delay attenuation.

[0026] Since the dispatching power 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.

[0027] Step S2 is the beginning stage of charging the energy storage battery, charging the energy storage system from photovoltaic or power grid, monitoring the first charging reference value of the energy storage battery when the energy storage battery is charging, and obtaining the second charging reference value of the dispatching storage capacity when the first charging reference value of the energy storage battery reaches the first target value; In this embodiment, the above charging reference values ​​are described by taking the existing constant current charging to constant voltage charging mode.

[0028] Common charging modes or stages include constant current charging, constant voltage charging, and trickle charging.

[0029] 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.

[0030] During the charging process, the battery voltage gradually rises, and the battery's charging 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.

[0031] During the constant current charging stage, the photovoltaic power generation system or charging controller will set a constant current according to the battery type, capacity and charging characteristics. For example, for lithium batteries, the constant current charging current is usually 0.2C-0.5C of the rated capacity of the battery (C is the capacity of the battery), that is, the charging current of the battery is 20%-50% of the rated capacity of the battery. In this process, the voltage of the battery rises, and the chemical reaction and charge transfer inside the battery begin, but because the battery voltage is low, the electrolyte and plates inside the battery are in a relatively stable state, so constant current charging can 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 time, it is necessary to obtain the second charging reference value of the scheduled storage capacity, and the second charging reference value can also be the voltage of the scheduled storage capacity.

[0032] Since the dispatching storage capacity is only used as trickle charging and cyclic load in this embodiment, its own capacity and actual power demand are not large and can be flexibly supplemented and consumed. Therefore, the dispatching storage capacity does not need to be fast charged in the constant current charging stage. Although fast charging can quickly replenish power, its heat generation and battery loss are also increased accordingly, and the application of the dispatching storage capacity has no practical significance. 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 at the same time, so that the second charging reference value of the dispatching storage capacity reaches the second target value, the 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, and the power of the dispatching storage capacity corresponding to the voltage value at this place needs to be able to maintain the trickle charging of the energy storage battery. Generally, by configuring the size of the dispatching charging capacity, the corresponding 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.

[0033] Further, 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; 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.

[0034] The charging current in this stage gradually decreases until the current drops to a preset threshold (such as 0.05C), and the charging process ends. In this process, once the battery voltage approaches the rated voltage, the charging system adjusts the charging current to maintain the battery voltage from increasing and maintain it at the set voltage value of the battery. The set voltage value represents the third target value. When the third target value is reached, it means that the constant voltage charging stage is completed. The constant voltage charging stage is set to ensure that the battery voltage is not overcharged and to avoid battery damage. This stage is very important, especially for lithium batteries, lead-acid batteries, etc.

[0035] The maximum charging voltage of a battery is determined by the chemical composition and design characteristics of the battery, and is directly related to the safety, life, and performance of the battery. Different types of batteries have different maximum charging voltage standards, which are usually specified based on the electrochemical reaction and material properties of the battery. The following are the maximum charging voltages and related parameters of several common battery types: 1. Lithium battery (Li-ion) Maximum charging voltage: usually 4.2V / cell (i.e. each battery cell). 4.2V is the common maximum safe charging voltage for lithium batteries. This voltage is the maximum value at which the battery material can work stably. Exceeding this voltage may cause dangers such as lithium metal precipitation, thermal runaway or battery expansion inside the battery.

[0036] 2. Lithium iron phosphate battery (LiFePO4) Maximum charging voltage: usually 3.65V / cell. The chemical structure of LiFePO4 batteries is more stable than traditional lithium batteries. Its maximum charging voltage is lower (3.65V) to prevent the risk of battery overheating or overcharging, while ensuring a longer service life.

[0037] 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 displayable state in the energy storage system.

[0038] However, the actual battery capacity is still slightly different from the actual full charge. In some complete charging solutions, this capacity gap is usually supplemented by trickle charging.

[0039] The trickle charge stage is the final stage of battery charging. Its main purpose is to continuously provide charge to the battery through a very small current after the battery is fully charged, maintain the battery's charging state, and prevent the battery from losing power due to self-discharge. The charging current in this stage is very small and is usually started after the battery is fully charged. The trickle charge current is generally less than 0.05C of the rated capacity of the battery. Through trickle charging, the battery can still maintain a full charge state when idle for a long time, thereby avoiding power loss caused by excessive self-discharge. However, long-term trickle charging may still cause overcharging of the battery, and overcharging of the battery is one of the important causes of battery degradation.

[0040] As the battery ages, the internal resistance of the battery increases and the chemical reaction efficiency decreases. These changes will cause the output voltage of the battery to drop, as shown in the following: Charging voltage drop: A degraded battery may not be able to reach the originally designed charging voltage. For example, the maximum charging voltage of a lithium battery may drop, causing the charger to be unable to fully charge the battery to the normal voltage value.

[0041] Discharge voltage drop: The discharge voltage of the battery will also drop. As the battery decays, the rate of drop of the battery voltage during the discharge process will accelerate. For example, the battery may reach the low voltage warning line earlier during the discharge process, causing the device to shut down prematurely.

[0042] 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 unsafe levels in a shorter period of time.

[0043] Therefore, in step S4 of the present embodiment, the first scheduling power storage mode is started, and the energy storage module is trickle charged by scheduling the power storage capacity. Compared with trickle charging the energy storage battery through the photovoltaic module, charging the energy storage battery through scheduling the power storage capacity can make the trickle charging not interrupted by the influence of light, and the working curve is more stable and the extension time is long. Compared with trickle charging after the AC power is converted into DC through the inverter, the energy conversion ratio of the electric energy is small, the load of the inverter circuit is small, and the overall heat generation of the system is greatly reduced.

[0044] The combination of the above charging stages is conducive to fast charging when the battery is low in power, and helps to ensure the safety and efficiency of battery charging, while extending the battery life. The current and voltage control strategies at different stages are designed to adapt to the different charging requirements of the battery and avoid problems such as overcharging and over-discharging.

[0045] 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 scheduling storage mode is started, and the scheduling storage capacity and the energy storage module act as loads to perform alternating charging and discharging. Step S5 is mainly used to solve the problem that when the energy storage battery is unloaded for a long time and is connected to the trickle charging mode, the energy storage battery remains fully charged for a long time, and cannot be effectively cycled and discharged, and decays. The total set threshold of this step is the time threshold, which can be set to 10 days in this embodiment.

[0046] After adopting the above method, firstly, the dispatching storage capacity can perform trickle charging on the energy storage battery, and keep 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 can naturally complete the charge and discharge cycle through the energy consumption during the mutual discharge, thereby maintaining the electrochemical activity of the energy storage battery and the dispatching battery and effectively reducing the battery attenuation rate.

[0047] In this embodiment, there are several ways to set the scheduling power storage capacity: In the first mode, the setting of the dispatching power storage capacity includes: Setting up a dispatching power storage unit and connecting the dispatching power storage unit to an energy storage system; In this mode, the dispatching battery is an additional battery accessory, which 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.

[0048] In the second method, 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.

[0049] In this mode, the battery of the energy storage system is a battery pack composed of multiple single cells, such as a stacked battery module. When the energy storage battery is in the form of a stacked battery, some of the batteries in the stacked battery can be used as energy storage batteries, and some of the batteries can be used as scheduling storage capacity. In this case, no external battery is required. The battery pack can be calibrated in the software of the charging management module. For example, the stacked battery is installed with five batteries, four of which are calibrated as energy storage units BU1-BU4, and the remaining battery is calibrated as a scheduling unit DU1. The energy storage units BU1-BU4 are used as energy storage batteries for power storage and external discharge in the energy storage system. The scheduling unit DU1 and the energy storage units BU1-BU4 are charged and discharged with each other via the DC bus, and are not charged and discharged externally.

[0050] In a possible implementation, setting the dispatching power storage capacity includes: The energy storage unit and the hybrid unit are calibrated, and the energy storage interval and the dispatching interval are calibrated in the hybrid unit. The energy storage unit and the energy storage interval serve as energy storage batteries, and the dispatching interval serves as a dispatching storage capacity.

[0051] In this mode, the energy storage battery is a battery pack composed of multiple single cells, each of which is composed of multiple battery cell groups connected in parallel. Taking a stacked battery with five batteries as an example, four of the batteries are calibrated as energy storage intervals B, and the remaining battery is calibrated as a mixed unit H through the software of the charging management module. Furthermore, the mixed unit H includes 10 battery cell groups B1-B10, B1-B5 of which are calibrated as energy storage intervals, and BX6-BX10 of which are calibrated as scheduling intervals D. When working, the energy storage intervals B and B1-B5 are used as energy storage batteries, and the scheduling interval D is used as the scheduling storage capacity.

[0052] like Figure 2 As shown, the second embodiment of the present application also provides a household photovoltaic integrated energy storage charging and discharging system, which includes: Energy storage battery 1, used for storing and providing electrical energy; A battery management module 2, connected to the energy storage battery, for monitoring the state of the energy storage battery, managing the charging and discharging of the energy storage battery and temperature control; the battery management module 2 includes a scheduling control unit 21; Photovoltaic module 3, used to convert light energy into direct current electricity; An inverter module 4, 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 dispatching power storage unit 5 , the dispatching control unit 21 is connected to and controls the dispatching power storage unit 5 .

[0053] 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 alternate charging and discharging. When the energy storage battery 1 is charged, a first charging reference value of the energy storage battery is monitored, and when the first charging reference value of the energy storage battery 1 reaches a first target value, a second charging reference value of the scheduling power storage unit 5 is acquired; 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 at the same time, and 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; When the second charging reference value of the energy storage battery 1 reaches the 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; 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 alternate charging and discharging.

[0054] 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 which the energy storage battery 1 includes an energy storage unit 11 and a dispatching unit 12; the battery management module 2 includes a calibration unit 22, an energy storage management unit 23 and a dispatching management unit 24; the calibration unit 22 connects the energy storage unit 11 and the dispatching unit 12 for unit calibration; the energy storage management unit 23 connects and controls the energy storage unit 11, and the dispatching management unit 24 connects and controls the dispatching unit 12. When working, the energy storage unit 11 is equivalent to the energy storage battery 1 in the second embodiment; the dispatching unit 12 is equivalent to the dispatching power storage unit 5 in the second embodiment.

[0055] 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; the scheduling management unit 28 connects and controls the scheduling interval 142. When working, 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; the scheduling interval 142 is equivalent to the scheduling storage unit 5 in the second embodiment.

[0056] Preferably, in the fourth embodiment, the energy storage interval and the scheduling interval are divided according to battery cells.

[0057] 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.

[0058] The above description is only a preferred embodiment of the embodiments of the present application, and does not limit the disclosure scope 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 used in other related technical fields, are also included in the patent protection scope supported by the embodiments of the present application.

Claims

1. A household photovoltaic integrated energy storage charging and discharging control method, characterized in that: Includes steps: Setting a dispatching power storage capacity and calibrating a first dispatching power storage mode and a second dispatching power storage mode, wherein in the first dispatching power storage mode, the dispatching power storage capacity performs trickle charging on the energy storage battery, and in the second dispatching power storage mode, the dispatching power storage capacity and the energy storage battery act as loads for alternate charging and discharging; Charging the energy storage battery and obtaining a first charging reference value of the energy storage battery, and 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 power storage capacity; 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, and after the second charging reference value of the dispatching storage capacity reaches the second target value, the charging of the dispatching storage capacity is stopped, and the first charging reference value of the energy storage battery is obtained again; When the first charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode, and performing trickle charging on the energy storage battery by scheduling the power storage capacity; The load signal of the energy storage battery is obtained, and when there is no load signal and the set threshold is reached, the second scheduling power storage mode is started, and the scheduling power storage capacity and the energy storage battery serve as loads for alternate 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 power storage capacity comprises: 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 power storage capacity comprises: 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 power storage capacity comprises: The energy storage unit and the mixed unit are calibrated, and the energy storage interval and the scheduling interval are calibrated in the mixed 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 charging and discharging system, characterized in that: The system includes: Energy storage batteries, used to store and provide electrical energy; A battery management module, connected to the energy storage battery, for monitoring the state of the energy storage battery, managing the charging and discharging of the energy storage battery and temperature control; 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 the dispatching power storage capacity and calibrates the first dispatching power storage mode and the second dispatching power storage mode. In the first dispatching power storage mode, the dispatching power storage capacity performs trickle charging on the energy storage battery. In the second dispatching power storage mode, the dispatching power storage capacity and the energy storage battery act as loads for alternate charging and discharging. monitoring a first charging reference value of the energy storage battery when the energy storage battery is charged, and acquiring a second charging reference value of the scheduling power 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, the energy storage battery and the dispatching storage capacity are charged simultaneously, and after the second charging reference value of the dispatching storage capacity reaches the second target value, the charging of the dispatching storage capacity is stopped, and the second charging reference value of the energy storage battery is obtained; When the second charging reference value of the energy storage battery reaches a third target value, starting the first scheduling power storage mode, and performing trickle charging on the energy storage battery by scheduling the power storage capacity; The load signal of the energy storage battery is obtained, and when there is no load signal and the set threshold is reached, the second scheduling power storage mode is started, and the scheduling power storage capacity and the energy storage battery serve as loads for alternate charging and discharging.

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

7. The household photovoltaic integrated energy storage and discharging system as claimed in 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 connects 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 charging and discharging system as claimed in 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 charging and discharging system as claimed in claim 8, characterized in that: The energy storage interval and the 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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