Flexible power supply method, device, computer device and storage device

Abstract

The present invention belongs to the technical field of power supply methods, and in particular, relates to a flexible power supply method, device, computer device and storage device. The flexible power supply method includes the following steps: obtaining the real-time energy of the photovoltaic component and the real-time power of the battery component; in the first case, controlling the photovoltaic component to supply power to the external load and charging the battery component; in the second case, controlling the photovoltaic component to supply power to the external load, and controlling the battery component to supply power to the external load; in the third case, controlling the unidirectional AC / DC module to start, and gradually increasing the output voltage of the unidirectional AC / DC module until the battery component stops supplying power, and then controlling the sine wave parameters of the unidirectional DC / AC module to be the same as the unidirectional AC / DC module, and finally controlling the switch to close and the unidirectional DC / AC module to disconnect, so that the AC power supply supplies power to the external load. The flexible power supply method does not require the power generation component to have an absorption capacity, and can ensure that the external load is not disconnected in various cases, and is more gentle when switching the power generation component to supply power.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply methods, and in particular relates to a flexible power supply method, device, computer device and storage device. Background Art

[0002] The power system can be divided into five major links: power generation, transmission, transformation, distribution, and consumption. Power generation refers to the conversion of various primary energy sources into electrical energy. Transmission refers to the transmission of electricity from power plants or power generation centers to power users or load centers, requiring long-distance and high-power transmission. Distribution refers to the reception of electrical energy from the transmission link and its distribution to users in various industries, requiring it to meet the diverse needs of these users and provide them with continuous, reliable, high-quality, and reasonably priced electricity. Transformation refers to the conversion of different voltage levels or the conversion of AC to DC during power production. Power consumption refers to industrial, agricultural, and domestic use.

[0003] With the increasing depletion of fossil energy, the advancement of renewable clean energy technology, the gradual reduction in the cost of new energy products, and the requirements of the country's dual carbon goals, the application of new energy will inevitably become more and more popular. Currently, new energy applications are divided into two types: grid-connected applications and off-grid applications.

[0004] Figure 1 The figure shows a grid-connected application scenario. Currently, solar power is mostly converted from photovoltaic modules to 400V AC power via a photovoltaic inverter. This power is then connected to the grid at the 380VAC output of a transformer on the user's side, or at the input of a transformer on the user's side, via an AC distribution cabinet. Due to the volatility and time-varying nature of solar and wind power, this AC bus coupling approach requires the grid to have the capacity to absorb and adjust the power output of the generator side (usually thermal power) in real time to ensure a real-time balance between power generation, transmission, distribution, and consumption. Building such a photovoltaic power station requires application and approval for an absorption quota, but the grid's absorption capacity for renewable energy is limited, generally around 15%. Currently, absorption capacity in many regions is at a red alert, with little remaining absorption quota. Therefore, the application of photovoltaic power generation directly connected to the grid, or self-generated and used power with surplus electricity connected to the grid, is restricted.

[0005] Figure 1 The diagram shows an off-grid application scenario. The MPPT module converts PV panels into controllable DC voltage and current, which are then fed into the DC bus. The energy storage battery also feeds the DC bus. The bidirectional DC / AC module extracts energy from the DC bus and inverts it into AC output voltage and current for the load. When PV panels are unavailable and the energy storage battery is depleted, the off-grid STS module connects the grid to the AC bus, providing power to users. The grid can also charge the battery through the bidirectional DC / AC module.

[0006] In this application, photovoltaic power generation is not connected to the grid, so fluctuations in photovoltaic power generation have no impact on the grid. However, when photovoltaic power generation is unavailable and the energy storage battery is depleted, the grid-connected AC bus connection provided by the STS module during the on-grid / off-grid switchover ensures uninterrupted power to the user. However, the user load is instantly supplied entirely by the grid. This means that at the moment of the switchover, the energy drawn from the grid suddenly increases from 0 to the user's load power. This sudden power surge also impacts the grid. For example, typical user equipment cannot tolerate power outages lasting more than 20ms. While the switchover time for low-power on-grid / off-grid systems can be controlled within 20ms, it still impacts the grid. For example, if a 500kW user load switches from renewable energy to the grid within 20ms, while this switchover ensures uninterrupted power to the user, the power drawn from the grid suddenly increases from 0 to 500kW, generating a surge current on the grid. If the user's load power is too high, switching between STS modules and the grid is difficult. Currently, the industry lacks a good solution for high-power on-grid and off-grid switching modules that can guarantee uninterrupted power to the user at the moment of switching. Furthermore, excessive user load power can create excessive surge currents on the grid, which is unacceptable to the grid.

[0007] Therefore, how to design a new energy power supply method that neither feeds power to the grid nor causes power outages to users and has no impact on the grid during the switching process has always been an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a flexible power supply method, device, computer device and storage device to fundamentally solve the existing off-grid application mode. Although it will not feed power to the power grid and will not cause power outages for users, there will be a problem of impact current on the power grid during the switching process.

[0009] An embodiment of the present invention is implemented by providing a flexible power supply method, which is applied to a power supply system. The power supply system includes a photovoltaic module, a battery module, a power generation module, and a unidirectional DC / AC module. The photovoltaic module, the battery module, and the power generation module are connected to the unidirectional DC / AC module. The power generation module includes an AC power supply, a unidirectional AC / DC module, and a switch. The AC power supply is connected to the unidirectional AC / DC module and the switch. The flexible power supply method includes the following steps:

[0010] Acquiring the real-time energy of the photovoltaic module and the real-time power of the battery module;

[0011] If the real-time energy is greater than a first energy threshold, controlling the photovoltaic assembly to supply power to an external load through the unidirectional DC / AC module and to charge the battery assembly;

[0012] If the real-time energy is less than the first energy threshold and greater than the second energy threshold, controlling the photovoltaic assembly to supply power to the external load via the unidirectional DC / AC module, and controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module;

[0013] If the real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, the unidirectional AC / DC module is controlled to start, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery assembly stops supplying power. Then, the sine wave parameters of the unidirectional DC / AC module are controlled to be the same as those of the unidirectional AC / DC module. Finally, the switch is controlled to be closed, and the unidirectional DC / AC module is disconnected, so that the AC power supply can power the external load.

[0014] In certain embodiments, the battery assembly includes at least one energy storage battery and at least one BMS module, the energy storage battery is connected to the BMS module, and charging the battery assembly includes the following steps:

[0015] Controlling the photovoltaic assembly to charge the energy storage battery through the BMS module, and when the energy storage battery is fully charged, adjusting the voltage of the photovoltaic assembly used to supply power to the external load to be consistent with the float charge voltage of the energy storage battery;

[0016] The controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module comprises the following steps:

[0017] The energy storage battery is controlled to supply power to the external load through the BMS module and the unidirectional DC / AC module.

[0018] In certain embodiments, the battery assembly includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module, the energy storage battery is connected to the BMS module, and the BMS module is connected to the bidirectional DC / DC module. Charging the battery assembly includes the following steps:

[0019] Controlling the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module;

[0020] The step of controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module comprises the following steps:

[0021] The energy storage battery is controlled to supply power to the external load through the BMS module, the bidirectional DC / DC module, and the unidirectional DC / AC module.

[0022] In some embodiments, the photovoltaic assembly includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and controlling the photovoltaic assembly to power an external load through the unidirectional DC / AC module includes the following steps:

[0023] Controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module;

[0024] The step of charging the battery assembly comprises the following steps:

[0025] The photovoltaic source is controlled to charge the battery assembly through the MPPT module.

[0026] Another embodiment of the present invention further provides a flexible power supply device, which is applied to a power supply system. The power supply system includes a photovoltaic module, a battery module, a power generation module, and a unidirectional DC / AC module. The photovoltaic module, the battery module, and the power generation module are connected to the unidirectional DC / AC module. The power generation module includes an AC power supply, a unidirectional AC / DC module, and a switch. The AC power supply is connected to the unidirectional AC / DC module and the switch. The flexible power supply device includes:

[0027] An acquisition unit, configured to acquire the real-time energy of the photovoltaic assembly and the real-time power of the battery assembly;

[0028] a first control unit, configured to control the photovoltaic assembly to supply power to an external load through the unidirectional DC / AC module and charge the battery assembly if the real-time energy is greater than a first energy threshold;

[0029] a second control unit, configured to control the photovoltaic assembly to supply power to the external load via the unidirectional DC / AC module, and control the battery assembly to supply power to the external load via the unidirectional DC / AC module, if the real-time energy is less than the first energy threshold and greater than a second energy threshold;

[0030] a third control unit, configured to control the unidirectional AC / DC module to start, and gradually increase the output voltage of the unidirectional AC / DC module until the battery assembly stops supplying power, if the real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, and then control the unidirectional DC / AC module to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally control the switch to close and the unidirectional DC / AC module to disconnect, so that the AC power supply can supply power to the external load.

[0031] In certain embodiments, the battery assembly includes at least one energy storage battery and at least one BMS module, the energy storage battery is connected to the BMS module, and the first control unit includes:

[0032] a first charging module, configured to control the photovoltaic assembly to charge the energy storage battery through the BMS module, and, when the energy storage battery is fully charged, adjust the voltage of the photovoltaic assembly used to supply power to the external load to be consistent with the float charge voltage of the energy storage battery;

[0033] The second control unit includes:

[0034] The first power supply module is used to control the energy storage battery to supply power to the external load through the BMS module and the unidirectional DC / AC module.

[0035] In certain embodiments, the battery assembly includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module, the energy storage battery is connected to the BMS module, the BMS module is connected to the bidirectional DC / DC module, and the first control unit includes:

[0036] a second charging module, configured to control the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module;

[0037] The second control unit includes:

[0038] The second power supply module is used to control the energy storage battery to supply power to the external load through the BMS module, the bidirectional DC / DC module and the unidirectional DC / AC module.

[0039] In some embodiments, the photovoltaic assembly includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and the first control unit and the second control unit each include:

[0040] a third power supply module, configured to control the photovoltaic source to supply power to an external load via the MPPT module and the unidirectional DC / AC module;

[0041] The first control unit includes:

[0042] The third charging module is used to control the photovoltaic source to charge the battery assembly through the MPPT module.

[0043] Another embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the flexible power supply method as described in any one of the embodiments of the present invention are implemented.

[0044] Another embodiment of the present invention further provides a storage device, wherein the storage device stores a computer program, and the computer program can be executed to implement the steps of the flexible power supply method as described in any one of the embodiments of the present invention.

[0045] The flexible power supply method provided by the embodiment of the present invention obtains the real-time energy of the photovoltaic component and the real-time power of the battery component; when the real-time energy of the photovoltaic component is greater than a first energy threshold, it is judged that the real-time energy of the photovoltaic component is sufficient, and the photovoltaic component is controlled to supply power to the external load through the unidirectional DC / AC module and to charge the battery component; when the real-time energy of the photovoltaic component is less than the first energy threshold and greater than a second energy threshold, it is judged that the real-time energy of the photovoltaic component is insufficient, and the photovoltaic component is controlled to supply power to the external load through the unidirectional DC / AC module, and the battery component is controlled to supply power to the external load through the unidirectional DC / AC module; in the real-time If the energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy of the photovoltaic module is less than the second energy threshold, and the real-time power of the battery module is less than the power threshold, it is judged that the real-time energy of the photovoltaic module is insufficient or extremely low or even non-existent, and the real-time power of the battery module is judged to be insufficient, the unidirectional AC / DC module is controlled to start, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery module stops supplying power, and then the sine wave parameters of the unidirectional DC / AC module and the unidirectional AC / DC module are controlled to be the same, and finally the switch is controlled to close and the unidirectional DC / AC module is disconnected, so that the unidirectional AC / DC module can supply power to the external load. This flexible power supply method does not require the power generation component to have absorption capacity, and can ensure that the external load is not disconnected in various situations. It is also more gentle when switching the power generation component to power the power, without impacting the power generation component, thereby effectively protecting the power generation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the off-grid application scenario of new energy provided by existing technology;

[0047] Figure 2 is a flowchart of a flexible power supply method provided by an embodiment of the present invention;

[0048] Figure 3 is a schematic diagram of a power supply system provided by an embodiment of the present invention;

[0049] Figure 4 is a schematic diagram of another power supply system provided by an embodiment of the present invention;

[0050] Figure 5 It is a structural block diagram of the flexible power supply device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0052] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0054] refer to Figure 2-Figure 4 An embodiment of the present invention provides a flexible power supply method, which is applied to a power supply system. The power supply system includes a photovoltaic module 10, a battery module 20, a power generation module 30, and a unidirectional DC / AC module 40. The photovoltaic module 10, the battery module 20, and the power generation module 30 are connected to the unidirectional DC / AC module 40. The power generation module 30 includes an AC power supply, a unidirectional AC / DC module, and a switch K. The AC power supply is connected to the unidirectional AC / DC module and the switch K. The flexible power supply method includes the following steps:

[0055] Step 100: obtaining the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20;

[0056] Step 200: If the real-time energy is greater than a first energy threshold, control the photovoltaic assembly 10 to supply power to an external load through the unidirectional DC / AC module 40 and charge the battery assembly 20;

[0057] Step 300: If the real-time energy is less than the first energy threshold and greater than the second energy threshold, control the photovoltaic assembly 10 to supply power to the external load via the unidirectional DC / AC module 40, and control the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40;

[0058] Step 400: If the real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, control the unidirectional AC / DC module to start, and gradually increase the output voltage of the unidirectional AC / DC module until the battery assembly 20 stops supplying power. Then, control the unidirectional DC / AC module 40 to have the same sinusoidal wave parameters as the unidirectional AC / DC module. Finally, control the switch K to close, and disconnect the unidirectional DC / AC module 40, so that the AC power supply can supply power to the external load.

[0059] A DC / AC module, or DC-to-AC converter, utilizes power electronics technology to convert DC power into AC power through an inverter circuit. The inverter circuit typically includes power switching devices (such as insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field-effect transistors (MOSFETs). These switching devices are continuously switched on and off according to a specific control strategy, thereby chopping and synthesizing the input DC voltage to output AC power. A unidirectional DC / AC module 40 is a DC / AC module that provides unidirectional flow. For example, in this embodiment, power flows from the photovoltaic module 10 and the battery module 20 through the unidirectional DC / AC module 40 to the external load. Power does not flow from the external load through the unidirectional DC / AC module 40 to the photovoltaic module 10 and the battery module 20, nor does power flow from the power generation module 30 through the unidirectional DC / AC module 40 to the photovoltaic module 10 and the battery module 20. In the present invention, the specific circuit structure of the unidirectional DC / AC module 40 is not limited, as long as it can achieve the corresponding functions of a unidirectional DC / AC module.

[0060] An AC / DC module, or AC-to-DC converter, primarily consists of a rectifier, a filter, and a voltage stabilizer. During operation, AC power first passes through a rectifier, converting it into pulsating DC power. Common rectifier circuits include half-wave rectification, full-wave rectification, and bridge rectification. A filter then removes the ripple component from the pulsating DC power, converting it into a smoother DC. Finally, a voltage stabilizer stabilizes the output voltage, ensuring a stable DC voltage output under varying load and input voltage conditions. A unidirectional AC / DC module refers to an AC / DC module with one-way current flow. For example, in this embodiment, current flows from the AC power source through the unidirectional AC / DC module to the external load, but does not flow from the external load through the unidirectional AC / DC module to the AC power source. In the present invention, the specific circuit structure of the unidirectional AC / DC module is not limited; as long as it can achieve the corresponding functions of a unidirectional AC / DC module, it will suffice.

[0061] refer to Figure 3 and Figure 4, user refers to the user load, which is the external load mentioned above.

[0062] In some embodiments, the AC power source comprises an AC input grid. In some embodiments, the AC power source comprises a generator. In some embodiments, the AC power source comprises an AC input grid and a generator.

[0063] In this embodiment, the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20 are first obtained.

[0064] When the real-time energy of the photovoltaic assembly 10 is greater than the first energy threshold, it is determined that the real-time energy of the photovoltaic assembly 10 is sufficient, and the photovoltaic assembly 10 is controlled to supply power to the external load through the unidirectional DC / AC module 40. Since the real-time energy of the photovoltaic assembly 10 is sufficient, the photovoltaic assembly 10 is also controlled to charge the battery assembly 20.

[0065] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold, it is determined that the real-time energy of the photovoltaic component 10 is insufficient, and the photovoltaic component 10 is controlled to supply power to the external load through the unidirectional DC / AC module 40. Since the real-time energy of the photovoltaic component 10 is insufficient, the battery component 20 is also controlled to supply power to the external load through the unidirectional DC / AC module 40.

[0066] When the real-time energy of the photovoltaic assembly 10 is less than the first energy threshold and greater than the second energy threshold, or the real-time energy of the photovoltaic assembly 10 is less than the second energy threshold, and the real-time power of the battery assembly 20 is less than the power threshold, it is determined that the real-time energy of the photovoltaic assembly 10 is insufficient or extremely low or even non-existent, and the real-time power of the battery assembly 20 is insufficient, the unidirectional AC / DC module is controlled to start, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery assembly 20 stops supplying power. The unidirectional DC / AC module 40 is then controlled to have the same sinusoidal wave parameters as the AC / DC module, and finally the switch K is controlled to be closed and the unidirectional DC / AC module 40 is disconnected, so that the AC power supply directly supplies power to the external load. In the process of gradually increasing the output voltage of the unidirectional AC / DC module until the battery assembly 20 stops supplying power, it can be adjusted slowly, for example, by adjusting up 50mV, 100mV, 150mV, 200mV, 250mV, 300mV, etc. in 1S, so as to control the speed at which the power generation assembly 30 provides power to the external load, for example, 1kW / S, 2kW / S, 3kW / S, 4kW / S, 5kW / S, etc.

[0067] The above-mentioned real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, which means including: ① The real-time energy is less than the first energy threshold and greater than the second energy threshold, and the real-time power is less than the power threshold; ② The real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold; the above two situations ① and ②.

[0068] The first energy threshold and the second energy threshold can be determined based on actual conditions through experience, experimentation or testing, and then specifically set. The power threshold can be determined based on actual conditions through experience, experimentation or testing, and then specifically set.

[0069] The aforementioned sine wave parameters refer to at least one of phase, frequency, and amplitude. In some embodiments, the sine wave parameters include phase, frequency, and amplitude. Phase is a physical quantity that describes the state of a periodic motion at a certain moment. It reflects the relative position of a periodically changing signal relative to a reference point or reference signal. Frequency refers to the number of periodic changes per unit time and is used to measure the speed at which a physical quantity (such as vibration, fluctuation, current, etc.) undergoes periodic and repetitive changes. Amplitude, also called amplitude, refers to the maximum absolute value of a periodically changing physical quantity that deviates from its equilibrium position during the change process.

[0070] In the flexible power supply method provided by the present invention, the photovoltaic modules 10, battery modules 20, and power generation modules 30 are converted into controllable high-voltage DC energy and aggregated together on a DC bus. The energy is then inverted into AC output power by a unidirectional DC / AC module 40 and provided to external loads. This avoids directly connecting unstable, fluctuating, and time-sensitive energy sources such as solar energy to the grid, and also avoids the requirement for the power generation module 30 to have an absorption capacity. Furthermore, because the DC bus aggregates not only the electricity provided by the photovoltaic modules 10 and battery modules 20, but also the electricity provided by the power generation module 30, even if the real-time energy of the photovoltaic modules 10 is insufficient, extremely low, or even non-existent, and the energy of the battery modules 20 is depleted, the power generation module 30 can still be guaranteed to supply power to the external loads, preventing power outages to the external loads. In addition, when the real-time energy of the photovoltaic component 10 is insufficient or extremely low or even non-existent, and the energy of the battery component 20 is exhausted, the unidirectional AC / DC module is started, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery component 20 stops supplying power. The unidirectional DC / AC module 40 then locks the sinusoidal wave parameters of the unidirectional AC / DC module, so that the sinusoidal wave parameters of the unidirectional DC / AC module 40 are the same as those of the unidirectional AC / DC module. Then, the switch K is closed, the unidirectional DC / AC module 40 is disconnected, and the external load is directly powered by the AC power supply. When switching the power supply of the power generation component 30, it is smoother and there is no impact on the power generation component 30, thereby effectively protecting the power generation component 30.

[0071] refer to Figure 3 In some specific embodiments of the present invention, the battery assembly 20 includes at least one energy storage battery and at least one BMS module, and the energy storage battery is connected to the BMS module. Charging the battery assembly 20 includes the following steps:

[0072] Controlling the photovoltaic assembly 10 to charge the energy storage battery through the BMS module, and when the energy storage battery is fully charged, adjusting the voltage of the photovoltaic assembly 10 for supplying power to the external load to be consistent with the float charge voltage of the energy storage battery;

[0073] The step of controlling the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40 includes the following steps:

[0074] The energy storage battery is controlled to supply power to the external load through the BMS module and the unidirectional DC / AC module 40 .

[0075] The BMS module, or Battery Management System, is a system that monitors and controls energy storage batteries. It primarily consists of the following components: The main control unit, typically a microcontroller (MCU) or microprocessor (MPU), acts as the "brain" of the entire BMS module, responsible for receiving data from various sensors, executing various state estimation and control algorithms, coordinating the operations of various components, and communicating with external devices. The acquisition unit, consisting of voltage, current, and temperature acquisition circuits, converts key battery parameters into electrical signals that can be processed by the main control unit, ensuring the accuracy and reliability of the collected data. The balancing circuit, a specific circuit module that implements the balancing function for energy storage batteries, varies depending on the balancing method (active or passive balancing), but their purpose is to regulate the charge and voltage differences between individual cells. The communication interface, which includes various interfaces such as CAN bus, RS485, SPI, or I2C, facilitates data exchange with external systems. The protection circuit, composed of various switching devices (such as relays and MOSFETs) and fuses, quickly shuts off the relevant circuits when it detects abnormal conditions such as overcharging, over-discharging, overheating, or short circuits in the energy storage battery, ensuring battery safety. The specific circuit structure of the BMS module is not limited in this invention, as long as it can achieve the corresponding battery management functions.

[0076] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, specifically, the photovoltaic assembly 10 is controlled to charge the energy storage battery through the BMS module. The BMS module controls the energy storage battery so that the photovoltaic assembly 10 charges the energy storage battery. When the energy storage battery is fully charged, for example, the BMS module identifies that the energy storage battery is fully charged, and adjusts the voltage of the photovoltaic assembly 10 to supply power to the external load to be consistent with the float charge voltage of the energy storage battery. The float charge voltage refers to the constant voltage value applied to the energy storage battery in order to maintain the energy storage battery in a fully charged state and compensate for the self-discharge loss of the energy storage battery when the energy storage battery is continuously charged for a long time.

[0077] The process of controlling the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40 specifically involves controlling the energy storage battery to supply power to the external load via the BMS module and the unidirectional DC / AC module 40. The BMS module controls the energy storage battery so that the energy storage battery supplies power to the external load via the unidirectional DC / AC module 40.

[0078] refer to Figure 4 In some specific embodiments of the present invention, the battery assembly 20 includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module. The energy storage battery is connected to the BMS module, and the BMS module is connected to the bidirectional DC / DC module. Charging the battery assembly 20 includes the following steps:

[0079] Controlling the photovoltaic assembly 10 to charge the energy storage battery through the bidirectional DC / DC module and the BMS module;

[0080] The step of controlling the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40 includes the following steps:

[0081] The energy storage battery is controlled to supply power to the external load through the BMS module, the bidirectional DC / DC module and the unidirectional DC / AC module 40 .

[0082] A DC / DC module, or DC / DC converter, converts input DC power into DC output power of varying voltage levels. It is categorized into buck, boost, and buck-boost types. In the buck type, when the switch is on, the input voltage is applied to the inductor and load, storing energy in the inductor and increasing the current. When the switch is off, the inductor releases energy to the load through the diode, maintaining the load current. By controlling the duty cycle of the switch, the output voltage can be adjusted, achieving a step-down function. In the boost type, when the switch is on, the input voltage charges the inductor, storing energy. When the switch is off, the induced electromotive force generated by the inductor is superimposed on the input voltage, charging the capacitor and supplying power to the load through the diode, thereby increasing the output voltage. The output voltage can also be adjusted by controlling the duty cycle. The buck-boost type combines the principles of buck and boost, allowing the output voltage to be either higher or lower than the input voltage. A bidirectional DC / DC module is a DC / DC module that allows for bidirectional flow. For example, in this embodiment, power can flow from the energy storage battery through the bidirectional DC / DC module to the external load, or from the photovoltaic module 10 through the bidirectional DC / DC module to the energy storage battery. In the present invention, the specific circuit structure of the bidirectional DC / DC module is not limited, as long as it can achieve the corresponding functions of the bidirectional DC / DC module.

[0083] When controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic assembly 10 is specifically controlled to charge the energy storage battery via the bidirectional DC / DC module and the BMS module. The bidirectional DC / DC module regulates the voltage, while the BMS module controls the energy storage battery, enabling the photovoltaic assembly 10 to charge the energy storage battery.

[0084] Controlling the battery assembly 20 to supply power to an external load via the unidirectional DC / AC module 40 specifically involves controlling the energy storage battery to supply power to the external load via the BMS module, the bidirectional DC / DC module, and the unidirectional DC / AC module 40. The BMS module controls the energy storage battery, enabling it to supply power to the external load via the bidirectional DC / DC module and the unidirectional DC / AC module 40. The bidirectional DC / DC module regulates the voltage.

[0085] refer to Figure 3 and Figure 4 In some specific embodiments of the present invention, the photovoltaic assembly 10 includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and controlling the photovoltaic assembly 10 to power an external load through the unidirectional DC / AC module 40 includes the following steps:

[0086] Controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module 40;

[0087] The charging of the battery assembly 20 includes the following steps:

[0088] The photovoltaic source is controlled to charge the battery assembly 20 through the MPPT module.

[0089] The MPPT module, whose full name is Maximum Power Point Tracking module, is an electrical module that plays an important role in photovoltaic systems. The MPPT module monitors the voltage and current output of the solar panel in real time, and uses a specific algorithm to adjust the load impedance of the panel, so as to find and track the operating point that can make the solar panel output the maximum power. Commonly used MPPT control algorithms include the perturbation observation method, the incremental conductance method, the constant voltage tracking method, etc. For example, the perturbation observation method periodically changes the load impedance and observes the change in power. If the power increases, the impedance continues to change in the same direction, otherwise it changes the direction, and repeats this process until the system stabilizes near the maximum power point. In the present invention, the specific circuit structure of the MPPT module is not limited, as long as it can realize the corresponding function of tracking the maximum power point in the photovoltaic system.

[0090] Controlling the photovoltaic assembly 10 to power an external load via the unidirectional DC / AC module 40 specifically involves controlling the photovoltaic source to power the external load via the MPPT module and the unidirectional DC / AC module 40. The MPPT module tracks the maximum power point during the power supply process, thereby maintaining maximum power and ensuring power supply efficiency. Both steps 200 and 300 involve controlling the photovoltaic assembly 10 to power an external load via the unidirectional DC / AC module 40, and both employ the aforementioned control method.

[0091] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, specifically controlling the photovoltaic source to charge the battery assembly 20 through the MPPT module. The MPPT module tracks the maximum power point during the charging process to maintain maximum power and thus ensure charging efficiency.

[0092] refer to Figure 3-Figure 5 Another embodiment of the present invention further provides a flexible power supply device, which is applied to a power supply system. The power supply system includes a photovoltaic module 10, a battery module 20, a power generation module 30, and a unidirectional DC / AC module 40. The photovoltaic module 10, the battery module 20, and the power generation module 30 are connected to the unidirectional DC / AC module 40. The power generation module 30 includes an AC power supply, a unidirectional AC / DC module, and a switch K. The AC power supply is connected to the unidirectional AC / DC module and the switch K. The flexible power supply device includes:

[0093] An acquisition unit 100 is configured to acquire the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20;

[0094] A first control unit 200 is configured to control the photovoltaic assembly 10 to supply power to an external load through the unidirectional DC / AC module 40 and charge the battery assembly 20 if the real-time energy is greater than a first energy threshold;

[0095] a second control unit 300, configured to control the photovoltaic assembly 10 to supply power to the external load via the unidirectional DC / AC module 40, and control the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40, if the real-time energy is less than the first energy threshold and greater than a second energy threshold;

[0096] The third control unit 400 is used to control the unidirectional AC / DC module to start if the real-time energy is less than the first energy threshold and greater than the second energy threshold or the real-time energy is less than the second energy threshold and the real-time power is less than the power threshold, and gradually increase the output voltage of the unidirectional AC / DC module until the battery assembly 20 stops supplying power, then control the unidirectional DC / AC module 40 to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally control the switch K to close and the unidirectional DC / AC module 40 to disconnect, so that the AC power supply can power the external load.

[0097] A DC / AC module, or DC-to-AC converter, utilizes power electronics technology to convert DC power into AC power through an inverter circuit. The inverter circuit typically includes power switching devices (such as insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field-effect transistors (MOSFETs). These switching devices are continuously switched on and off according to a specific control strategy, thereby chopping and synthesizing the input DC voltage to output AC power. A unidirectional DC / AC module 40 is a DC / AC module that provides unidirectional flow. For example, in this embodiment, power flows from the photovoltaic module 10 and the battery module 20 through the unidirectional DC / AC module 40 to the external load. Power does not flow from the external load through the unidirectional DC / AC module 40 to the photovoltaic module 10 and the battery module 20, nor does power flow from the power generation module 30 through the unidirectional DC / AC module 40 to the photovoltaic module 10 and the battery module 20. In the present invention, the specific circuit structure of the unidirectional DC / AC module 40 is not limited, as long as it can achieve the corresponding functions of a unidirectional DC / AC module.

[0098] An AC / DC module, or AC-to-DC converter, primarily consists of a rectifier, a filter, and a voltage stabilizer. During operation, AC power first passes through a rectifier, converting it into pulsating DC power. Common rectifier circuits include half-wave rectification, full-wave rectification, and bridge rectification. A filter then removes the ripple component from the pulsating DC power, converting it into a smoother DC. Finally, a voltage stabilizer stabilizes the output voltage, ensuring a stable DC voltage output under varying load and input voltage conditions. A unidirectional AC / DC module refers to an AC / DC module with one-way current flow. For example, in this embodiment, current flows from the AC power source through the unidirectional AC / DC module to the external load, but does not flow from the external load through the unidirectional AC / DC module to the AC power source. In the present invention, the specific circuit structure of the unidirectional AC / DC module is not limited; as long as it can achieve the corresponding functions of a unidirectional AC / DC module, it will suffice.

[0099] refer to Figure 3 and Figure 4 , user refers to the user load, which is the external load mentioned above.

[0100] In some embodiments, the AC power source comprises an AC input grid. In some embodiments, the AC power source comprises a generator. In some embodiments, the AC power source comprises an AC input grid and a generator.

[0101] In this embodiment, the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20 are first obtained.

[0102] When the real-time energy of the photovoltaic assembly 10 is greater than the first energy threshold, it is determined that the real-time energy of the photovoltaic assembly 10 is sufficient, and the photovoltaic assembly 10 is controlled to supply power to the external load through the unidirectional DC / AC module 40. Since the real-time energy of the photovoltaic assembly 10 is sufficient, the photovoltaic assembly 10 is also controlled to charge the battery assembly 20.

[0103] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold, it is determined that the real-time energy of the photovoltaic component 10 is insufficient, and the photovoltaic component 10 is controlled to supply power to the external load through the unidirectional DC / AC module 40. Since the real-time energy of the photovoltaic component 10 is insufficient, the battery component 20 is also controlled to supply power to the external load through the unidirectional DC / AC module 40.

[0104] When the real-time energy of the photovoltaic assembly 10 is less than the first energy threshold and greater than the second energy threshold, or the real-time energy of the photovoltaic assembly 10 is less than the second energy threshold, and the real-time power of the battery assembly 20 is less than the power threshold, it is determined that the real-time energy of the photovoltaic assembly 10 is insufficient or extremely low or even non-existent, and the real-time power of the battery assembly 20 is insufficient, the unidirectional AC / DC module is controlled to start, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery assembly 20 stops supplying power. The unidirectional DC / AC module 40 is then controlled to have the same sinusoidal wave parameters as the AC / DC module, and finally the switch K is controlled to be closed and the unidirectional DC / AC module 40 is disconnected, so that the AC power supply directly supplies power to the external load. In the process of gradually increasing the output voltage of the unidirectional AC / DC module until the battery assembly 20 stops supplying power, it can be adjusted slowly, for example, by adjusting up 50mV, 100mV, 150mV, 200mV, 250mV, 300mV, etc. in 1S, so as to control the speed at which the power generation assembly 30 provides power to the external load, for example, 1kW / S, 2kW / S, 3kW / S, 4kW / S, 5kW / S, etc.

[0105] The above-mentioned real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, which means including: ① The real-time energy is less than the first energy threshold and greater than the second energy threshold, and the real-time power is less than the power threshold; ② The real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold; the above two situations ① and ②.

[0106] The first energy threshold and the second energy threshold can be determined based on actual conditions through experience, experimentation or testing, and then specifically set. The power threshold can be determined based on actual conditions through experience, experimentation or testing, and then specifically set.

[0107] The aforementioned sine wave parameters refer to at least one of phase, frequency, and amplitude. In some embodiments, the sine wave parameters include phase, frequency, and amplitude. Phase is a physical quantity that describes the state of a periodic motion at a certain moment. It reflects the relative position of a periodically changing signal relative to a reference point or reference signal. Frequency refers to the number of periodic changes per unit time and is used to measure the speed at which a physical quantity (such as vibration, fluctuation, current, etc.) undergoes periodic and repetitive changes. Amplitude, also called amplitude, refers to the maximum absolute value of a periodically changing physical quantity that deviates from its equilibrium position during the change process.

[0108] In the flexible power supply device provided by the present invention, the photovoltaic modules 10, battery modules 20, and power generation modules 30 are converted into controllable high-voltage DC energy and aggregated together on a DC bus. The energy is then inverted into AC output power by a unidirectional DC / AC module 40 and provided to external loads. This avoids the need to directly connect unstable, fluctuating, and time-sensitive energy sources such as solar energy to the grid, and also avoids the requirement for the power generation module 30 to have an absorption capacity. Furthermore, because the DC bus aggregates not only the electricity provided by the photovoltaic modules 10 and battery modules 20, but also the electricity provided by the power generation module 30, even if the real-time energy of the photovoltaic modules 10 is insufficient, extremely low, or even non-existent, and the energy of the battery modules 20 is depleted, the power generation module 30 can still be guaranteed to supply power to the external loads, preventing power outages to the external loads. In addition, when the real-time energy of the photovoltaic component 10 is insufficient or extremely low or even non-existent, and the energy of the battery component 20 is exhausted, the unidirectional AC / DC module is started, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery component 20 stops supplying power. The unidirectional DC / AC module 40 then locks the sinusoidal wave parameters of the unidirectional AC / DC module, so that the sinusoidal wave parameters of the unidirectional DC / AC module 40 are the same as those of the unidirectional AC / DC module. Then, the switch K is closed, the unidirectional DC / AC module 40 is disconnected, and the external load is directly powered by the AC power supply. When switching the power supply of the power generation component 30, it is smoother and there is no impact on the power generation component 30, thereby effectively protecting the power generation component 30.

[0109] refer to Figure 3 In some specific embodiments of the present invention, the battery assembly 20 includes at least one energy storage battery and at least one BMS module, the energy storage battery is connected to the BMS module, and the first control unit 200 includes:

[0110] a first charging module, configured to control the photovoltaic assembly 10 to charge the energy storage battery through the BMS module, and, when the energy storage battery is fully charged, adjust the voltage of the photovoltaic assembly 10 used to supply power to the external load to be consistent with the float charge voltage of the energy storage battery;

[0111] The second control unit 300 includes:

[0112] The first power supply module is used to control the energy storage battery to supply power to the external load through the BMS module and the unidirectional DC / AC module 40 .

[0113] The BMS module, or Battery Management System, is a system that monitors and controls energy storage batteries. It primarily consists of the following components: The main control unit, typically a microcontroller (MCU) or microprocessor (MPU), acts as the "brain" of the entire BMS module, responsible for receiving data from various sensors, executing various state estimation and control algorithms, coordinating the operations of various components, and communicating with external devices. The acquisition unit, consisting of voltage, current, and temperature acquisition circuits, converts key battery parameters into electrical signals that can be processed by the main control unit, ensuring the accuracy and reliability of the collected data. The balancing circuit, a specific circuit module that implements the balancing function for energy storage batteries, varies depending on the balancing method (active or passive balancing), but their purpose is to regulate the charge and voltage differences between individual cells. The communication interface, which includes various interfaces such as CAN bus, RS485, SPI, or I2C, facilitates data exchange with external systems. The protection circuit, composed of various switching devices (such as relays and MOSFETs) and fuses, quickly shuts off the relevant circuits when it detects abnormal conditions such as overcharging, over-discharging, overheating, or short circuits in the energy storage battery, ensuring battery safety. The specific circuit structure of the BMS module is not limited in this invention, as long as it can achieve the corresponding battery management functions.

[0114] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, specifically, the photovoltaic assembly 10 is controlled to charge the energy storage battery through the BMS module. The BMS module controls the energy storage battery so that the photovoltaic assembly 10 charges the energy storage battery. When the energy storage battery is fully charged, for example, the BMS module identifies that the energy storage battery is fully charged, and adjusts the voltage of the photovoltaic assembly 10 to supply power to the external load to be consistent with the float charge voltage of the energy storage battery. The float charge voltage refers to the constant voltage value applied to the energy storage battery in order to maintain the energy storage battery in a fully charged state and compensate for the self-discharge loss of the energy storage battery when the energy storage battery is continuously charged for a long time.

[0115] The process of controlling the battery assembly 20 to supply power to the external load via the unidirectional DC / AC module 40 specifically involves controlling the energy storage battery to supply power to the external load via the BMS module and the unidirectional DC / AC module 40. The BMS module controls the energy storage battery so that the energy storage battery supplies power to the external load via the unidirectional DC / AC module 40.

[0116] refer to Figure 4In some specific embodiments of the present invention, the battery assembly 20 includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module. The energy storage battery is connected to the BMS module, and the BMS module is connected to the bidirectional DC / DC module. The first control unit 200 includes:

[0117] a second charging module, configured to control the photovoltaic assembly 10 to charge the energy storage battery via the bidirectional DC / DC module and the BMS module;

[0118] The second control unit 300 includes:

[0119] The second power supply module is used to control the energy storage battery to supply power to the external load through the BMS module, the bidirectional DC / DC module and the unidirectional DC / AC module 40 .

[0120] A DC / DC module, or DC / DC converter, converts input DC power into DC output power of varying voltage levels. It is categorized into buck, boost, and buck-boost types. In the buck type, when the switch is on, the input voltage is applied to the inductor and load, storing energy in the inductor and increasing the current. When the switch is off, the inductor releases energy to the load through the diode, maintaining the load current. By controlling the duty cycle of the switch, the output voltage can be adjusted, achieving a step-down function. In the boost type, when the switch is on, the input voltage charges the inductor, storing energy. When the switch is off, the induced electromotive force generated by the inductor is superimposed on the input voltage, charging the capacitor and supplying power to the load through the diode, thereby increasing the output voltage. The output voltage can also be adjusted by controlling the duty cycle. The buck-boost type combines the principles of buck and boost, allowing the output voltage to be either higher or lower than the input voltage. A bidirectional DC / DC module is a DC / DC module that allows for bidirectional flow. For example, in this embodiment, power can flow from the energy storage battery through the bidirectional DC / DC module to the external load, or from the photovoltaic module 10 through the bidirectional DC / DC module to the energy storage battery. In the present invention, the specific circuit structure of the bidirectional DC / DC module is not limited, as long as it can achieve the corresponding functions of the bidirectional DC / DC module.

[0121] When controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic assembly 10 is specifically controlled to charge the energy storage battery via the bidirectional DC / DC module and the BMS module. The bidirectional DC / DC module regulates the voltage, while the BMS module controls the energy storage battery, enabling the photovoltaic assembly 10 to charge the energy storage battery.

[0122] Controlling the battery assembly 20 to supply power to an external load via the unidirectional DC / AC module 40 specifically involves controlling the energy storage battery to supply power to the external load via the BMS module, the bidirectional DC / DC module, and the unidirectional DC / AC module 40. The BMS module controls the energy storage battery, enabling it to supply power to the external load via the bidirectional DC / DC module and the unidirectional DC / AC module 40. The bidirectional DC / DC module regulates the voltage.

[0123] refer to Figure 3 and Figure 4 In some specific embodiments of the present invention, the photovoltaic assembly 10 includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and the first control unit 200 and the second control unit 300 both include:

[0124] a third power supply module, configured to control the photovoltaic source to supply power to an external load via the MPPT module and the unidirectional DC / AC module 40;

[0125] The first control unit 200 includes:

[0126] The third charging module is used to control the photovoltaic source to charge the battery assembly 20 through the MPPT module.

[0127] The MPPT module, whose full name is Maximum Power Point Tracking module, is an electrical module that plays an important role in photovoltaic systems. The MPPT module monitors the voltage and current output of the solar panel in real time, and uses a specific algorithm to adjust the load impedance of the panel, so as to find and track the operating point that can make the solar panel output the maximum power. Commonly used MPPT control algorithms include the perturbation observation method, the incremental conductance method, the constant voltage tracking method, etc. For example, the perturbation observation method periodically changes the load impedance and observes the change in power. If the power increases, the impedance continues to change in the same direction, otherwise it changes the direction, and repeats this process until the system stabilizes near the maximum power point. In the present invention, the specific circuit structure of the MPPT module is not limited, as long as it can realize the corresponding function of tracking the maximum power point in the photovoltaic system.

[0128] The process of controlling the photovoltaic assembly 10 to power an external load via the unidirectional DC / AC module 40 specifically involves controlling the photovoltaic source to power the external load via the MPPT module and the unidirectional DC / AC module 40. The MPPT module tracks the maximum power point during the power supply process, thereby maintaining maximum power and ensuring power supply efficiency. Both the first control unit 200 and the second control unit 300 control the photovoltaic assembly 10 to power an external load via the unidirectional DC / AC module 40, and both employ the aforementioned control method.

[0129] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, specifically controlling the photovoltaic source to charge the battery assembly 20 through the MPPT module. The MPPT module tracks the maximum power point during the charging process to maintain maximum power and thus ensure charging efficiency.

[0130] An embodiment of the present invention provides a computer device, which includes a processor, and the processor is configured to implement the steps of the flexible power supply method described above when executing a computer program stored in a memory.

[0131] An embodiment of the present invention further provides a computer-readable storage medium having a computer program (instructions) stored thereon. When the computer program (instructions) is executed by a processor, the steps of the flexible power supply method described above are implemented.

[0132] Exemplarily, a computer program can be divided into one or more modules, one or more of which are stored in a memory and executed by a processor to implement the present invention. One or more modules can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in a computer device. For example, the computer program can be divided into the steps of the flexible power supply method provided in each of the above-mentioned method embodiments.

[0133] Those skilled in the art will understand that the above description of the computer device is merely an example and does not constitute a limitation on the computer device. The computer device may include more or fewer components than described above, or a combination of certain components, or different components, for example, input and output devices, network access devices, buses, etc.

[0134] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the computer device and connects various parts of the entire computer device using various interfaces and lines.

[0135] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as an interface display function, an interface interaction function, etc.); the data storage area may store data created based on the use of the mobile phone (such as a map interface, a selection interface, etc.). In addition, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0136] If the modules / units integrated into the computer device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the processes in the above-mentioned method embodiments by using a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, electrical signal, and software distribution medium.

[0137] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0138] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A flexible power supply method, characterized in that: Applied to a power supply system, the power supply system includes a photovoltaic component, a battery component, a power generation component and a unidirectional DC / AC module, the photovoltaic component, the battery component and the power generation component are connected to the unidirectional DC / AC module, the power generation component includes an AC power supply, a unidirectional AC / DC module and a switch, the AC power supply is connected to the unidirectional AC / DC module and the switch, and the flexible power supply method includes the following steps: Acquiring the real-time energy of the photovoltaic module and the real-time power of the battery module; If the real-time energy is greater than a first energy threshold, controlling the photovoltaic assembly to supply power to an external load through the unidirectional DC / AC module and to charge the battery assembly; If the real-time energy is less than the first energy threshold and greater than the second energy threshold, controlling the photovoltaic assembly to supply power to the external load via the unidirectional DC / AC module, and controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module; If the real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, the unidirectional AC / DC module is controlled to start, and the output voltage of the unidirectional AC / DC module is gradually increased until the battery assembly stops supplying power. Then, the sine wave parameters of the unidirectional DC / AC module are controlled to be the same as those of the unidirectional AC / DC module. Finally, the switch is controlled to be closed, and the unidirectional DC / AC module is disconnected, so that the AC power supply can power the external load.

2. The flexible power supply method according to claim 1, characterized in that: The battery assembly includes at least one energy storage battery and at least one BMS module, the energy storage battery is connected to the BMS module, and charging the battery assembly includes the following steps: Controlling the photovoltaic assembly to charge the energy storage battery through the BMS module, and when the energy storage battery is fully charged, adjusting the voltage of the photovoltaic assembly used to supply power to the external load to be consistent with the float charge voltage of the energy storage battery; The step of controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module comprises the following steps: The energy storage battery is controlled to supply power to the external load through the BMS module and the unidirectional DC / AC module.

3. The flexible power supply method according to claim 1, characterized in that: The battery assembly includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module. The energy storage battery is connected to the BMS module, and the BMS module is connected to the bidirectional DC / DC module. Charging the battery assembly includes the following steps: Controlling the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The step of controlling the battery assembly to supply power to the external load via the unidirectional DC / AC module comprises the following steps: The energy storage battery is controlled to supply power to the external load through the BMS module, the bidirectional DC / DC module, and the unidirectional DC / AC module.

4. The flexible power supply method according to claim 1, characterized in that: The photovoltaic assembly includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and the photovoltaic assembly is controlled to supply power to an external load through the unidirectional DC / AC module, including the following steps: Controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module; The step of charging the battery assembly comprises the following steps: The photovoltaic source is controlled to charge the battery assembly through the MPPT module.

5. A flexible power supply device, characterized in that: Applied to a power supply system, the power supply system includes a photovoltaic component, a battery component, a power generation component and a unidirectional DC / AC module, the photovoltaic component, the battery component and the power generation component are connected to the unidirectional DC / AC module, the power generation component includes an AC power supply, a unidirectional AC / DC module and a switch, the AC power supply is connected to the unidirectional AC / DC module and the switch, and the flexible power supply device includes: An acquisition unit, configured to acquire the real-time energy of the photovoltaic assembly and the real-time power of the battery assembly; a first control unit, configured to control the photovoltaic assembly to supply power to an external load through the unidirectional DC / AC module and charge the battery assembly if the real-time energy is greater than a first energy threshold; a second control unit, configured to control the photovoltaic assembly to supply power to the external load via the unidirectional DC / AC module, and control the battery assembly to supply power to the external load via the unidirectional DC / AC module, if the real-time energy is less than the first energy threshold and greater than a second energy threshold; a third control unit, configured to control the unidirectional AC / DC module to start, and gradually increase the output voltage of the unidirectional AC / DC module until the battery assembly stops supplying power, if the real-time energy is less than the first energy threshold and greater than the second energy threshold, or the real-time energy is less than the second energy threshold, and the real-time power is less than the power threshold, and then control the unidirectional DC / AC module to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally control the switch to close and the unidirectional DC / AC module to disconnect, so that the AC power supply can supply power to the external load.

6. The flexible power supply device according to claim 5, characterized in that: The battery assembly includes at least one energy storage battery and at least one BMS module, the energy storage battery is connected to the BMS module, and the first control unit includes: a first charging module, configured to control the photovoltaic assembly to charge the energy storage battery through the BMS module, and, when the energy storage battery is fully charged, adjust the voltage of the photovoltaic assembly used to supply power to the external load to be consistent with the float charge voltage of the energy storage battery; The second control unit includes: The first power supply module is used to control the energy storage battery to supply power to the external load through the BMS module and the unidirectional DC / AC module.

7. The flexible power supply device according to claim 5, characterized in that: The battery assembly includes at least one energy storage battery, at least one BMS module, and at least one bidirectional DC / DC module. The energy storage battery is connected to the BMS module, and the BMS module is connected to the bidirectional DC / DC module. The first control unit includes: a second charging module, configured to control the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The second control unit includes: The second power supply module is used to control the energy storage battery to supply power to the external load through the BMS module, the bidirectional DC / DC module and the unidirectional DC / AC module.

8. The flexible power supply device according to claim 5, characterized in that: The photovoltaic assembly includes a photovoltaic source and an MPPT module, the photovoltaic source is connected to the MPPT module, and the first control unit and the second control unit each include: a third power supply module, configured to control the photovoltaic source to supply power to an external load via the MPPT module and the unidirectional DC / AC module; The first control unit includes: The third charging module is used to control the photovoltaic source to charge the battery assembly through the MPPT module.

9. A computer device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the flexible power supply method according to any one of claims 1 to 4 when executing the computer program.

10. A storage device, characterized in that: The storage device stores a computer program, which can be executed to implement the steps of the flexible power supply method according to any one of claims 1 to 4.

Images