Optical storage DCDC circuit and control method thereof

Abstract

The invention provides an optical storage DCDC circuit and a control method thereof, and belongs to the technical field of household optical storage all-in-one machine control, and the circuit comprises a photovoltaic input port which is connected with a DC bus through a second switch K2 and comprises a first inductor L1, a first switch tube S1 and an anti-reverse circuit; the energy storage battery port is connected with the direct current bus through a first switch K1 and comprises a second inductor L2, a half-bridge power circuit and a follow current protection circuit of the half-bridge power circuit; the shared bus capacitor C is connected in parallel with the output ends of the photovoltaic input port and the energy storage battery port; and the controller is connected with the photovoltaic side power acquisition device and the battery side power acquisition device, and controls the on-off combination of the switch and the switch tube based on the photovoltaic working state, the photovoltaic output power and the battery charge state so as to switch the working mode. According to the invention, the photovoltaic DCDC and the energy storage DCDC are combined into one universal bidirectional DCDC, so that several operation modes of photovoltaic power generation, energy storage charging and discharging and photovoltaic energy storage charging can be realized, communication among modules is reduced, the operation efficiency is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of residential photovoltaic storage integrated machine control technology, and more specifically, relates to a photovoltaic storage DC-DC circuit and its control method. Background Technology

[0002] As a type of home energy system that integrates photovoltaic power generation, energy storage batteries and grid interaction, the core converter module of a residential photovoltaic-energy storage system typically includes independent photovoltaic DC-DC modules and energy storage DC-DC modules. The two need to be connected in communication and controlled by different main controllers, which to some extent increases the size of the converter module and increases the cost.

[0003] The prior art document (CN120150088A) discloses a grid-connected DC microgrid system integrating photovoltaic, energy storage, and charging, and its control strategy. It connects the photovoltaic array to the DC bus through a Boost circuit, connects the energy storage battery pack and supercapacitor pack to the DC bus through a DC-DC converter, connects the DC bus to the main grid through a bidirectional DC-AC converter, and dynamically controls the number of parallel output paths of charging piles through a power distribution unit. However, its photovoltaic DC-DC and energy storage DC-DC are still independent modules, and the mode cannot be switched through control. This has the disadvantages of increasing the communication connection between modules, increasing the size of the converter module, reducing the system integration, and increasing the cost. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a photoelectric storage DC-DC circuit and its control method.

[0005] The present invention adopts the following technical solution.

[0006] A first aspect of the present invention provides an optical storage DC-DC circuit, the circuit comprising:

[0007] The photovoltaic input port is connected to the DC bus via the second switch K2, and includes the first inductor L1, the first switch S1, and the anti-reverse circuit.

[0008] The energy storage battery port is connected to the DC bus via the first switch K1, and includes the second inductor L2, a half-bridge power circuit and its freewheeling protection circuit.

[0009] The shared bus capacitor C is connected in parallel to the output terminals of the photovoltaic input port and the energy storage battery port.

[0010] The controller connects the photovoltaic-side power acquisition device and the battery-side power acquisition device. Based on the photovoltaic operating status, photovoltaic output power and battery state of charge, it controls the on / off combination of the first switch K1, the second switch K2, the first switch S1, the second switch S2 and the third switch S3 to switch the operating mode.

[0011] The first switch K1 is initially in the normally open state, and the second switch K2 is initially in the normally closed state.

[0012] Optionally, the anti-reverse circuit includes a first anti-reverse diode D1 and a second anti-reverse diode D4 connected between the positive and negative terminals of the photovoltaic input port and the DC bus.

[0013] Optionally, the half-bridge power circuit is composed of a second switch S2 and a third switch S3 connected in parallel, with the midpoint connected to the second inductor L2.

[0014] Optionally, the freewheeling protection circuit includes a first freewheeling diode D2 connected in parallel to the second switch S2 and a second freewheeling diode D3 connected in parallel to the third switch S3.

[0015] Optionally, in the half-bridge power circuit:

[0016] The source of the second switch S2 and the drain of the third switch S3 are connected to the second inductor L2.

[0017] The drain of the second switch S2 is connected to the positive terminal of the DC bus, and the source of the third switch S3 is connected to the negative terminal of the DC bus.

[0018] A second aspect of the present invention provides a control method for a photoelectric storage DC-DC circuit, based on the photoelectric storage DC-DC circuit described in the first aspect of the present invention, comprising the following steps:

[0019] The system is powered on and initialized. The second switch K2 is closed to connect to the photovoltaic system, and the first switch K1 is opened.

[0020] Real-time monitoring of photovoltaic operating status, photovoltaic output power, battery state of charge, and load power demand;

[0021] Based on the photovoltaic operating state (normal or abnormal), the comparison between photovoltaic output power and load power demand, and the comparison between battery state of charge and preset threshold, the on / off combination of the first switch K1, the second switch K2, the first switch S1, the second switch S2, and the third switch S3 is dynamically controlled to adaptively switch the operating mode.

[0022] Optionally, the operating mode includes:

[0023] Photovoltaic independent power generation mode, grid charging and energy storage mode, energy storage discharge mode, photovoltaic and energy storage combined discharge mode, and photovoltaic charging and energy storage mode.

[0024] Optionally, the operating mode is achieved through the following switch states:

[0025] In the photovoltaic independent power generation mode, the second switch K2 is closed, the first switch K1 is open, and the first switch tube S1 is closed.

[0026] In the grid charging and energy storage mode, the second switch K2 is open, the first switch K1 is closed, the second switch S2 is closed, and the third switch S3 is open;

[0027] In energy storage discharge mode, the second switch K2 is open, the first switch K1 is closed, the third switch S3 is closed, and the second switch S2 is open.

[0028] In the combined photovoltaic and energy storage discharge mode, the first switch K1 and the second switch K2 are closed, the first switch S1 and the third switch S3 are closed, and the second switch S2 is open.

[0029] In the photovoltaic charging and energy storage mode, the first switch K1 and the second switch K2 are closed, the first switch tube S1 and the second switch tube S2 are closed, and the third switch tube S3 is open.

[0030] Optionally, the adaptive switching operating mode includes:

[0031] When the photovoltaic system is in an abnormal operating state and the battery state of charge is below the charging threshold, it switches to grid charging and energy storage mode.

[0032] When the photovoltaic system is in an abnormal operating state and the battery state of charge is not lower than the discharge threshold, switch to energy storage discharge mode.

[0033] When the photovoltaic system is working normally and the photovoltaic output power is not less than the load power requirement, switch to photovoltaic independent power generation mode;

[0034] When the photovoltaic system is working normally, the photovoltaic output power is less than the load power requirement, and the battery state of charge is not lower than the discharge threshold, switch to the photovoltaic-storage combined discharge mode.

[0035] When the photovoltaic system is operating normally, the photovoltaic output power is less than the load power requirement, and the battery state of charge is lower than the charging threshold, switch to photovoltaic charging and energy storage mode.

[0036] A third aspect of the present invention provides a residential integrated photovoltaic and energy storage system, comprising:

[0037] A photoelectric storage DC-DC circuit according to the second aspect of the present invention;

[0038] A photovoltaic module is connected to the photovoltaic input port of the photovoltaic-storage DC-DC adaptive circuit;

[0039] An energy storage battery is connected to the energy storage battery port of the photovoltaic-DC-adaptive circuit.

[0040] The power grid interface connects to the DC bus via a bidirectional DC-AC converter.

[0041] A photovoltaic power acquisition device is used to monitor the photovoltaic operating status and output power.

[0042] A battery-side power acquisition device is used to monitor the battery's state of charge.

[0043] A load-side power acquisition device is used to obtain the load power demand in real time.

[0044] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0045] By adding two controllable switches to select the control circuit, the photovoltaic DC-DC and energy storage DC-DC are combined into a universal bidirectional DC-DC, which can realize several operating modes such as photovoltaic power generation, energy storage charging and discharging, and photovoltaic charging of energy storage. This reduces communication between modules, improves operating efficiency, and reduces manufacturing costs. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a photovoltaic + energy storage DC-DC circuit topology provided according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of system operation according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the switch control logic provided according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0050] In Embodiment 1, the present invention provides a photoelectric storage DC-DC circuit, the circuit comprising:

[0051] The photovoltaic input unit is connected to the DC bus via the second switch K2, and includes a first inductor L1 connected in series, a first switch S1 connected in parallel, a first anti-reverse diode D1, and a second anti-reverse diode D4.

[0052] The energy storage battery unit is connected to the DC bus through the first switch K1 and includes a second inductor L2 connected in series, a second switch S2 with a half-bridge structure, a third switch S3, a first freewheeling diode D2, and a second freewheeling diode D3.

[0053] The shared bus capacitor C is connected in parallel to the output terminals of the photovoltaic input unit and the energy storage battery unit;

[0054] The control module connects the photovoltaic-side power acquisition module and the battery-side power acquisition module. Based on the photovoltaic operating status, photovoltaic output power and battery state of charge, it controls the on / off state of the first switch K1, the second switch K2 and the switching transistors S1-S3, and adaptively switches to the corresponding operating modes.

[0055] Preferably, the photovoltaic input unit and the shared bus capacitor C form a photovoltaic DC-DC converter, and the energy storage battery unit and the shared bus capacitor C form a bidirectional energy storage DC-DC converter.

[0056] Preferably, the optical storage DC-DC circuit further includes:

[0057] The first switch K1 is initially open, and K2 is initially closed. After power is applied, it is preferentially connected to the photovoltaic system.

[0058] Preferably, the photovoltaic input unit further includes:

[0059] The first anti-reverse diode D1 and the second anti-reverse diode D4 are connected across the positive and negative terminals of the photovoltaic input unit and the DC bus.

[0060] Preferably, the energy storage battery unit further includes:

[0061] The first freewheeling diode D2 and the second freewheeling diode D3 are connected in parallel across the two ends of the second switch S2 and the third switch S3, respectively.

[0062] Preferably, the energy storage battery unit further includes:

[0063] The half-bridge structure is composed of a second switch S2 and a third switch S3 connected in parallel, with the midpoint connected to a second inductor L2.

[0064] It should be noted that, in response to the problems of existing photovoltaic DC-DC and energy storage DC-DC technologies, which are independent modules, resulting in increased communication connections, larger converter module size, low system integration, and high manufacturing costs, this invention integrates the photovoltaic input unit (including L1 / S1 / D1 / D4) and the energy storage battery unit (including L2 / S2 / S3 / D2 / D3) into an adaptive circuit with a shared bus capacitor C by adding a first switch K1 and a second switch K2 and controlling their on / off combination. This achieves the effects of reducing communication connections between modules, reducing the overall size of the converter module, improving system integration, and reducing manufacturing costs. At the same time, it supports adaptive switching of five operating modes: independent photovoltaic power generation, grid charging and energy storage, energy storage discharge, photovoltaic-energy storage combined discharge, and photovoltaic charging and energy storage.

[0065] In Embodiment 2, this invention provides a control method for a photoelectric storage DC-DC circuit, based on the photoelectric storage DC-DC circuit described in Embodiment 1, comprising the following steps:

[0066] Step 1: Initialize the system after power-on, including: closing the second switch K2, connecting the photovoltaic input unit, and disconnecting the first switch K1 and disconnecting the energy storage battery unit.

[0067] Step 2: Monitor the operating status, output power of the photovoltaic input unit, and battery data of the energy storage battery unit in real time.

[0068] Step 3: Based on the photovoltaic operating status being normal or abnormal, the comparison relationship between photovoltaic output power and load power demand, and the comparison relationship between battery state of charge and preset threshold, the system adaptively switches to the corresponding operating mode by controlling the on / off combination of the first switch K1 / K2 and the first switch tubes S1-S3, including: photovoltaic independent power generation mode, grid charging and energy storage mode, energy storage discharge mode, photovoltaic-energy storage combined discharge mode, and photovoltaic charging and energy storage mode.

[0069] Preferably, in step 3, switching to the corresponding operating mode based on real-time monitoring data and load power requirements includes:

[0070] When an abnormality is detected in the photovoltaic input unit, if the battery SOC is less than the charging threshold, the system switches to grid charging and energy storage mode; if the battery SOC is greater than or equal to the discharging threshold, the system switches to energy storage discharging mode.

[0071] When the photovoltaic input unit is detected to be normal and the output power is greater than or equal to the load power requirement, switch to photovoltaic independent power generation mode;

[0072] When the photovoltaic input unit is detected to be normal but the output power is less than the load power requirement, if the battery SOC is greater than or equal to the discharge threshold, the system switches to the photovoltaic-storage combined discharge mode; if the battery SOC is less than the charging threshold, the system switches to the photovoltaic charging-storage mode.

[0073] More preferably, the charging threshold is 10% of the battery SOC and the discharging threshold is 20% of the battery SOC. If the battery charge is below 10%, there is a risk of over-discharging the battery, which will damage the battery performance.

[0074] More preferably, the load power demand is detected in real time by a load-side power acquisition module (such as an electricity meter) and fed back to the control module.

[0075] More preferably, the implementation of each working mode includes:

[0076] In the independent photovoltaic power generation mode, K2 is closed, K1 is open, and S1 is closed.

[0077] In grid charging and energy storage mode, K2 is open, K1 is closed, S2 is closed and S3 is open;

[0078] In energy storage discharge mode, K2 is open, K1 is closed, S3 is closed, and S2 is open;

[0079] In the combined photovoltaic-storage discharge mode, K1 and K2 are closed, S1 and S3 are closed, and S2 is open.

[0080] In the photovoltaic charging and energy storage mode, K1 and K2 are closed, S1 and S2 are closed, and S3 is open.

[0081] More preferably, in the photovoltaic-storage combined discharge mode, the photovoltaic DC-DC and the energy storage DC-DC operate synchronously in a boost state.

[0082] More preferably, in the photovoltaic charging and energy storage mode, the photovoltaic DC-DC converter boosts the output, and the energy storage DC-DC converter steps down to charge.

[0083] In Embodiment 3, this invention provides a residential integrated photovoltaic and energy storage system, comprising:

[0084] An optical storage DC-DC circuit as described in Embodiment 1 of the present invention;

[0085] A photovoltaic module is connected to the photovoltaic input port of the photovoltaic-storage DC-DC adaptive circuit;

[0086] An energy storage battery is connected to the energy storage battery port of the photovoltaic-DC-adaptive circuit.

[0087] The power grid interface connects to the DC bus via a bidirectional DC-AC converter.

[0088] A photovoltaic power acquisition device is used to monitor the photovoltaic operating status and output power.

[0089] A battery-side power acquisition device is used to monitor the battery's state of charge.

[0090] A load-side power acquisition device is used to obtain the load power demand in real time.

[0091] In Embodiment 4, this invention provides an adaptive circuit and control method for integrating photovoltaic and energy storage DC-DC converters, based on the schemes described in Embodiments 1 and 2, including:

[0092] like Figure 1 As shown:

[0093] The photovoltaic DC-DC converter consists of L1, S1, D1, D4, and C. The closing of switch K2 controls whether this part of the circuit is connected to the DC bus. Controlling the conduction of S1 enables photovoltaic power generation. Inductor L1 stores energy and smooths current. Diodes D1 and D4 prevent reverse polarity, and capacitor C smooths DC bus voltage fluctuations.

[0094] The bidirectional DC-DC energy storage section consists of L2, S2, S3, D2, D3, and C. The closing of the control switch K1 can control whether the energy storage battery is connected, and the opening of S2 and S3 can realize the charging and discharging of the energy storage battery. The function of inductor L2 is to store energy and smooth the current, and the function of capacitor C is to smooth the DC bus voltage fluctuation.

[0095] Switch K1 is normally open, and switch K2 is normally closed. After the system is powered on and operating normally, it will automatically connect to the photovoltaic system and control the switching states of K1 and K2 based on power comparison and battery data. When switches K1 and K2 are closed simultaneously, both the photovoltaic system and the energy storage system can operate concurrently. The PV power acquisition module and the battery power acquisition module acquire the output power from the photovoltaic side and the energy storage side, respectively.

[0096] like Figure 2 As shown:

[0097] This system prioritizes the use of photovoltaic power generation and energy storage discharge to minimize grid usage and save on electricity costs.

[0098] Operating Mode 1: Photovoltaic Power Generation Mode. With switch K2 closed and switch K1 open, the system connects only to photovoltaic power. Switch S1 closes, operating in boost mode to achieve photovoltaic power generation.

[0099] Operating Mode 2: Grid-charged energy storage mode. With switch K2 open and switch K1 closed, the system only connects to energy storage. When S2 is closed and S3 is open, D3 freewheels, the circuit operates in buck mode, and the bus charges the energy storage battery.

[0100] Operating Mode 3: Energy Storage Discharge Mode. With switch K2 open and switch K1 closed, the system only connects to the energy storage. When S3 is closed and S2 is open, D2 freewheels, the circuit operates in boost mode, and the energy storage battery discharges to the DC bus.

[0101] Operating Mode 4: Simultaneous Discharge Mode of Photovoltaic and Energy Storage. Close switches K1 and K2, and the system simultaneously connects photovoltaic and energy storage. Close switches S1 and S3, and D2 freewheels, allowing both the photovoltaic DC-DC converter and the energy storage DC-DC converter to operate in boost mode, achieving simultaneous discharge of photovoltaic and energy storage components.

[0102] Operating Mode 5: Photovoltaic charging of energy storage mode. Close switches K1 and K2, and the system simultaneously connects photovoltaic and energy storage. Close switches S1 and S2, and D3 freewheels the current. The photovoltaic DC-DC converter operates in boost mode, and the energy storage DC-DC converter operates in buck mode, realizing photovoltaic charging of energy storage.

[0103] like Figure 3 As shown:

[0104] Switch K1 is normally open, and switch K2 is normally closed. After the system is powered on and running normally, it will automatically connect to the photovoltaic system and determine the switching states of K1 and K2 by comparing power and battery data.

[0105] The system first checks for any abnormalities on the photovoltaic side. If an abnormality is found, K2 is disconnected to cut off the photovoltaic power, and K1 is closed to connect to the energy storage. At this time, the system uses battery data to determine whether the battery needs charging. If charging is needed, the energy storage is charged through the grid; otherwise, the energy storage operates in discharge mode.

[0106] If there are no abnormalities on the photovoltaic side, K2 remains closed. At this time, the PV power device determines whether the photovoltaic power meets the load requirements. If it does, K1 is not closed, and the photovoltaic power generation can meet the requirements; if it does not, K1 is closed to connect the energy storage. When the energy storage has sufficient power, the photovoltaic and energy storage discharge together; when the energy storage has insufficient power, the operation mode of the photovoltaic charging the energy storage is switched.

[0107] This invention integrates a traditional photovoltaic DC-DC converter and an energy storage DC-DC converter into an integrated photovoltaic + energy storage DC-DC converter that can simultaneously meet the needs of photovoltaic power generation and energy storage charging and discharging. It has a photovoltaic power acquisition module and an energy storage battery data acquisition module, and can adaptively adjust the on / off state of the switch through feedback data to achieve several different working modes.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A photoelectric storage DC-DC circuit, characterized in that, The circuit includes: The photovoltaic input port is connected to the DC bus via the second switch K2, and includes the first inductor L1, the first switch S1, and the anti-reverse circuit. The energy storage battery port is connected to the DC bus via the first switch K1, and includes the second inductor L2, a half-bridge power circuit and its freewheeling protection circuit. The shared bus capacitor C is connected in parallel to the output terminals of the photovoltaic input port and the energy storage battery port. The controller connects the photovoltaic-side power acquisition device and the battery-side power acquisition device. Based on the photovoltaic operating status, photovoltaic output power and battery state of charge, it controls the on / off combination of the first switch K1, the second switch K2, the first switch S1, the second switch S2 and the third switch S3 to switch the operating mode. The first switch K1 is initially in the normally open state, and the second switch K2 is initially in the normally closed state.

2. The optical storage DC-DC circuit according to claim 1, characterized in that: The anti-reverse circuit includes a first anti-reverse diode D1 and a second anti-reverse diode D4 connected between the positive and negative terminals of the photovoltaic input port and the DC bus.

3. The optical storage DC-DC circuit according to claim 1, characterized in that: The half-bridge power circuit is composed of a second switch S2 and a third switch S3 connected in parallel, with the midpoint connected to the second inductor L2.

4. The optical storage DC-DC circuit according to claim 1, characterized in that: The freewheeling protection circuit includes a first freewheeling diode D2 connected in parallel to the second switch S2 and a second freewheeling diode D3 connected in parallel to the third switch S3.

5. The optical storage DC-DC circuit according to claim 1, characterized in that: In the half-bridge power circuit: The source of the second switch S2 and the drain of the third switch S3 are connected to the second inductor L2. The drain of the second switch S2 is connected to the positive terminal of the DC bus, and the source of the third switch S3 is connected to the negative terminal of the DC bus.

6. A control method for a photovoltaic-storage DC-DC circuit, based on the photovoltaic-storage DC-DC circuit according to any one of claims 1-5, characterized in that, Includes the following steps: The system is powered on and initialized. The second switch K2 is closed to connect to the photovoltaic system, and the first switch K1 is opened. Real-time monitoring of photovoltaic operating status, photovoltaic output power, battery state of charge, and load power demand; Based on the photovoltaic operating state (normal or abnormal), the comparison between photovoltaic output power and load power demand, and the comparison between battery state of charge and preset threshold, the on / off combination of the first switch K1, the second switch K2, the first switch S1, the second switch S2, and the third switch S3 is dynamically controlled to adaptively switch the operating mode.

7. The method for controlling a photovoltaic storage DC-DC circuit according to claim 6, characterized in that: The working modes include: Photovoltaic independent power generation mode, grid charging and energy storage mode, energy storage discharge mode, photovoltaic and energy storage combined discharge mode, and photovoltaic charging and energy storage mode.

8. The method for controlling a photovoltaic storage DC-DC circuit according to claim 7, characterized in that: The operating mode is achieved through the following switch states: In the photovoltaic independent power generation mode, the second switch K2 is closed, the first switch K1 is open, and the first switch tube S1 is closed. In the grid charging and energy storage mode, the second switch K2 is open, the first switch K1 is closed, the second switch S2 is closed, and the third switch S3 is open; In energy storage discharge mode, the second switch K2 is open, the first switch K1 is closed, the third switch S3 is closed, and the second switch S2 is open. In the combined photovoltaic and energy storage discharge mode, the first switch K1 and the second switch K2 are closed, the first switch S1 and the third switch S3 are closed, and the second switch S2 is open. In the photovoltaic charging and energy storage mode, the first switch K1 and the second switch K2 are closed, the first switch tube S1 and the second switch tube S2 are closed, and the third switch tube S3 is open.

9. A method for controlling a photovoltaic storage DC-DC circuit according to claim 8, characterized in that: The adaptive switching working mode includes: When the photovoltaic system is in an abnormal operating state and the battery state of charge is below the charging threshold, it switches to grid charging and energy storage mode. When the photovoltaic system is in an abnormal operating state and the battery state of charge is not lower than the discharge threshold, switch to energy storage discharge mode. When the photovoltaic system is working normally and the photovoltaic output power is not less than the load power requirement, switch to photovoltaic independent power generation mode; When the photovoltaic system is working normally, the photovoltaic output power is less than the load power requirement, and the battery state of charge is not lower than the discharge threshold, switch to the photovoltaic-storage combined discharge mode. When the photovoltaic system is operating normally, the photovoltaic output power is less than the load power requirement, and the battery state of charge is lower than the charging threshold, switch to photovoltaic charging and energy storage mode.

10. A residential integrated photovoltaic and energy storage system, characterized in that, Include: A photoelectric storage DC-DC circuit according to any one of claims 1-5; A photovoltaic module is connected to the photovoltaic input port of the photovoltaic-storage DC-DC adaptive circuit; An energy storage battery is connected to the energy storage battery port of the photovoltaic-DC-adaptive circuit. The power grid interface connects to the DC bus via a bidirectional DC-AC converter. A photovoltaic power acquisition device is used to monitor the photovoltaic operating status and output power. A battery-side power acquisition device is used to monitor the battery's state of charge. A load-side power acquisition device is used to obtain the load power demand in real time.

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