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

Abstract

The invention belongs to the technical field of power supply methods, and particularly relates to a flexible power supply method and device, a computer device and a storage device. The flexible power supply method comprises the following steps: acquiring real-time energy of a photovoltaic module and real-time electric quantity of a battery module; under the first condition, the photovoltaic assembly is controlled to supply power to an external load and charge the battery assembly; under the second condition, the photovoltaic assembly is controlled to supply power to the external load, and the battery assembly is controlled to supply power to the external load; under the third condition, the one-way AC / DC module is controlled to be started, the output voltage of the one-way AC / DC module is increased step by step till the battery assembly stops supplying power, the sine wave parameters of the one-way DC / AC module and the sine wave parameters of the one-way AC / DC module are controlled to be the same, and finally the switch is controlled to be switched on, the one-way DC / AC module is controlled to be switched off, so that the one-way AC / DC module supplies power to the external load. According to the flexible power supply method, the power generation assembly does not need to have the absorption capacity, it can be guaranteed that the external load is not powered off under various conditions, and power supply of the power generation assembly is softer when switched.

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 power consumption. Power generation refers to the conversion of various primary energy sources into electrical energy; power transmission refers to the transmission from power plants or power generation centers to power users or power load centers, and requires it to be able to transmit over long distances and at high power; power distribution refers to receiving electrical energy from the transmission link and distributing it to users in all walks of life, and requires it to meet the different needs of various users and provide users with continuous, reliable, quality, and reasonably priced electrical energy; transformation refers to the conversion of different voltage levels or the conversion of AC and DC in power production; power consumption refers to industrial power consumption, agricultural power consumption, and domestic power consumption, etc.

[0003] With the decreasing fossil energy, the advancement of renewable clean energy utilization technology, the gradual reduction of new energy product costs, and the requirements of the national dual carbon goals, the application of new energy will inevitably become more and more popular. At present, the application of new energy is divided into two types: grid-connected application and off-grid application.

[0004] Figure 1 The grid-connected application scenario is shown. Currently, most of the solar energy is used by photovoltaic modules to be converted into 400V AC power by photovoltaic inverters, and then connected to the grid at the output end of the transformer on the user side at 380VAC through the AC distribution cabinet, or connected to the grid at the input end of the transformer on the user side. Due to the volatility and time period of solar energy, wind energy, etc., this AC bus coupling method requires the grid to have the ability to absorb and adjust the power generation side (commonly thermal power generation) in real time, so as to ensure that the generation, transmission, distribution and use of electricity are balanced in real time at the same moment. To build such a photovoltaic power station, it is necessary to apply for and report the absorption index, and the grid's new energy absorption capacity is limited, generally about 15%. At present, the absorption capacity in many areas is in red warning, and there is almost no remaining absorption index. Therefore, the application of photovoltaic power generation directly connected to the grid or self-generated and self-used surplus power connected to the grid is restricted.

[0005] Figure 1 The off-grid application scenario is shown. The photovoltaic components are transformed into controllable DC voltage and current by the MPPT module and gathered on the DC bus. The energy storage battery is also gathered on the DC bus. The bidirectional DC / AC module obtains energy from the DC bus and inverts it into AC output voltage and current for the load. When there is no photovoltaic power and the energy storage battery is exhausted, the off-grid STS module is switched to connect the grid to the AC bus for users to use. At the same time, the grid can also charge the battery through the bidirectional DC / AC module.

[0006] In this application, photovoltaic power is not connected to the grid, and the fluctuation of photovoltaic power has no effect on the grid. When there is no photovoltaic power and the energy storage battery is exhausted, the moment when the grid is connected to the AC bus by the STS module for on-grid switching can ensure that the user does not lose power, but the user load is instantly provided by the grid, that is, the energy obtained from the grid suddenly changes from 0 to the user load power at the moment of switching. Such power mutation also has an impact on the grid. For example, general user equipment cannot accept power outages of more than 20ms. The low-power on-grid switching time can be controlled within 20ms, but it has an impact on the grid. If the user load power of 500KW is switched from new energy power supply to grid power supply within 20ms, although the switching within 20ms can ensure that the user does not lose power, the load power of 500KW is switched to the grid within 20ms, and the power obtained from the grid suddenly changes from 0 to 500KW at the moment of switching, which will form an impact current on the grid. If the user's load power is too large, it is difficult to switch the STS module on and off the grid. At present, there is no good solution in the industry for high-power on-grid and off-grid switching modules that can ensure that users do not lose power at the moment of switching. Moreover, if the user's load power is too large, it will form an excessive impact current on the power grid, which is unacceptable to the power grid.

[0007] Therefore, how to design a new energy power supply method that neither feeds power to the power grid nor causes power outages to users and has no impact on the power grid during the switching process has always been a problem that needs to be solved urgently by technical personnel in this field. 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] The embodiment of the present invention is implemented as follows: a flexible power supply method is provided, which is applied to a power supply system, wherein the power supply system includes a photovoltaic component, a battery component, a power generation component and a unidirectional DC / AC module, wherein the photovoltaic component, the battery component and the power generation component are connected to the unidirectional DC / AC module, wherein the power generation component includes an AC power supply, a unidirectional AC / DC module and a switch, wherein the AC power supply is connected to the unidirectional AC / DC module and the switch, and wherein the flexible power supply method includes the following steps: Acquiring the real-time energy of the photovoltaic component and the real-time power of the battery component; 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 charging the battery assembly; If the real-time energy is less than the first energy threshold and greater than the second energy threshold, control the photovoltaic assembly to supply power to the external load through the unidirectional DC / AC module, and control the battery assembly to supply power to the external load through 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, and then the unidirectional DC / AC module is controlled to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally the switch is controlled to be closed and the unidirectional DC / AC module is disconnected, so that the unidirectional AC / DC module can supply power to the external load.

[0010] In some 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: 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 to supply power to the external load to be consistent with the floating 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.

[0011] In some 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 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.

[0012] 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 controlling the photovoltaic assembly to power an external load through the unidirectional DC / AC module includes 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.

[0013] 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 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. The flexible power supply device includes: An acquisition unit, used for acquiring 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 through the unidirectional DC / AC module, and control the battery assembly to supply power to the external load through 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, for controlling the unidirectional AC / DC module to start, and gradually increasing 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 controlling the unidirectional DC / AC module to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally controlling the switch to close and the unidirectional DC / AC module to disconnect, so that the unidirectional AC / DC module supplies power to the external load.

[0014] In some 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: A first charging module, used 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 to supply power to the external load to be consistent with the floating charge voltage of the energy storage battery; The second control unit comprises: 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.

[0015] In some 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: A second charging module, used for controlling the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The second control unit comprises: 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.

[0016] 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 both include: A third power supply module, used for controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module; The first control unit comprises: The third charging module is used to control the photovoltaic source to charge the battery assembly through the MPPT module.

[0017] 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.

[0018] 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.

[0019] 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 an external load through a 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 an external load through a unidirectional DC / AC module, and the battery component is controlled to supply power to an external load through a 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 component is less than the second energy threshold, and the real-time power of the battery component is less than the power threshold, it is judged that the real-time energy of the photovoltaic component is insufficient or extremely low or even absent, and the real-time power of the battery component 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 component stops supplying power, and then the unidirectional DC / AC module is controlled to have the same sine wave parameters as the unidirectional AC / DC module, and finally the switch is controlled to close and the unidirectional DC / AC module is disconnected, so that the unidirectional AC / DC module supplies 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 more gentle when switching the power generation component, and there is no impact on the power generation component, so that the power generation component can be effectively protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the off-grid application scenario of new energy provided by the existing technology; Figure 2 is a flowchart of a flexible power supply method provided by an embodiment of the present invention; Figure 3 is a schematic diagram of a power supply system provided by an embodiment of the present invention; Figure 4 is a schematic diagram of another power supply system provided by an embodiment of the present invention; Figure 5 It is a structural block diagram of a flexible power supply device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] 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 a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] refer to Figure 2-Figure 4 The 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 component 10, a battery component 20, a power generation component 30 and a unidirectional DC / AC module 40. The photovoltaic component 10, the battery component 20 and the power generation component 30 are connected to the unidirectional DC / AC module 40. The power generation component 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: Step 100, obtaining the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20; 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; 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 through the unidirectional DC / AC module 40, and control the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40; 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, and finally control the switch K to close and the unidirectional DC / AC module 40 to disconnect, so that the unidirectional AC / DC module can supply power to the external load.

[0025] The DC / AC module is a DC to AC module, and its basic principle is to use power electronic conversion technology to convert DC power into AC power through an inverter circuit. The inverter circuit generally includes power switching devices (such as insulated gate bipolar transistors IGBT, metal oxide semiconductor field effect transistors MOSFET, etc.). According to a certain control strategy, these switching devices are continuously turned on and off, so as to chop and synthesize the input DC voltage, and then output AC power. The unidirectional DC / AC module 40 refers to a unidirectional DC / AC module. For example, in this embodiment, it flows from the photovoltaic component 10 side and the battery component 20 side through the unidirectional DC / AC module 40 to the external load side, and will not flow from the external load side through the unidirectional DC / AC module 40 to the photovoltaic component 10 side and the battery component 20 side, nor will it flow from the power generation component 30 side through the unidirectional DC / AC module 40 to the photovoltaic component 10 side and the battery component 20 side. In the present invention, the specific circuit structure of the unidirectional DC / AC module 40 is not limited, as long as the corresponding functions of the unidirectional DC / AC module can be realized.

[0026] AC / DC module is an AC to DC module, which is mainly composed of a rectifier, a filter and a voltage stabilizer. When working, the AC first passes through the rectifier to convert it into pulsating DC. Commonly used rectifier circuits include half-wave rectification, full-wave rectification and bridge rectification. Then, after being processed by the filter, the ripple component in the pulsating DC is filtered out and converted into a relatively smooth DC. Finally, the output voltage is stabilized by the voltage stabilizer so that it can maintain a stable DC voltage output under different load and input voltage changes. A unidirectional AC / DC module refers to an AC / DC module with unidirectional flow. For example, in this embodiment, it flows from the AC power supply side through the unidirectional AC / DC module to the external load side, and will not flow from the external load side to the AC power supply side through the unidirectional AC / DC module. In the present invention, the specific circuit structure of the unidirectional AC / DC module is not limited, as long as the corresponding function of the unidirectional AC / DC module can be realized.

[0027] refer to Figure 3 and Figure 4 , user refers to the user load, which is the external load mentioned above.

[0028] 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.

[0029] In this embodiment, the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20 are firstly obtained.

[0030] When the real-time energy of the photovoltaic component 10 is greater than the first energy threshold, it is determined that the real-time energy of the photovoltaic component 10 is sufficient, 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 sufficient, the photovoltaic component 10 is also controlled to charge the battery component 20.

[0031] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold, the real-time energy of the photovoltaic component 10 is determined to be 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.

[0032] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold or the real-time energy of the photovoltaic component 10 is less than the second energy threshold, and the real-time power of the battery component 20 is less than the power threshold, it is judged that the real-time energy of the photovoltaic component 10 is insufficient or extremely low or even absent, and the real-time power of the battery component 20 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 component 20 stops supplying power, and then the unidirectional DC / AC module 40 is 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 power input by the unidirectional AC / DC module 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 upward by 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.

[0033] 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.

[0034] The first energy threshold and the second energy threshold can be obtained through experience, experiment or test according to the actual situation, and then specifically set. The power threshold can be obtained through experience, experiment or test according to the actual situation, and then specifically set.

[0035] The above-mentioned 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 periodic motion at a certain moment, which reflects the relative position of the periodically changing signal relative to a reference point or reference signal. Frequency refers to the number of periodic changes per unit time, which is used to measure the speed of periodic repetitive changes of a physical quantity (such as vibration, fluctuation, current, etc.). Amplitude is also called amplitude, which refers to the maximum absolute value of the periodically changing physical quantity deviating from its equilibrium position during the change process.

[0036] In the flexible power supply method provided by the present invention, the photovoltaic assembly 10, the battery assembly 20, and the power generation assembly 30 are transformed into controllable high-voltage DC energy, and gathered together on the DC bus, and then inverted into AC output power by the unidirectional DC / AC module 40 to provide to the external load for use, thereby avoiding the direct grid connection of unstable, volatile, and time-limited energy such as solar energy, and also avoiding the requirement for the power generation assembly 30 to have an absorption capacity. In addition, since the DC bus not only gathers the electricity provided by the photovoltaic assembly 10 and the battery assembly 20, but also gathers the electricity provided by the power generation assembly 30, even if the real-time energy of the photovoltaic assembly 10 is insufficient or extremely low or even non-existent, and the energy of the battery assembly 20 is exhausted, it can still be guaranteed that the power generation assembly 30 supplies power to the external load, and the external load will not be powered off. 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 to disconnect the unidirectional DC / AC module 40, and the external load is directly powered by the unidirectional AC / DC module. 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.

[0037] 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 charging the battery assembly 20 includes the following steps: 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 floating charge voltage of the energy storage battery; The controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40 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 40 .

[0038] The BMS module, or Battery Management System, is a system that monitors and controls energy storage batteries. It mainly includes the following parts: The main control unit, which is usually a microcontroller (MCU) or microprocessor (MPU), is equivalent to the "brain" of the entire BMS module, responsible for receiving data collected by various sensors, running various state estimation and control algorithms, coordinating the work of various parts, and communicating with external devices. The acquisition unit, which consists of a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit, etc., is responsible for converting the key parameters of the energy storage battery into electrical signals that can be recognized and processed by the main control unit to ensure that the collected data is accurate and reliable. The balancing circuit is a specific circuit module that realizes the balancing function of the energy storage battery. Its circuit structure varies depending on the balancing method (active balancing or passive balancing), but its purpose is to adjust the power and voltage differences between single cells. The communication interface has a variety of communication interfaces, such as CAN bus interface, RS485 interface, SPI interface or I2C interface, etc., which is convenient for exchanging data with external systems. The protection circuit is composed of various switch devices (such as relays, MOSFET, etc.), fuses, etc. When the energy storage battery is detected to be overcharged, over-discharged, over-heated, short-circuited, etc., it can quickly act to cut off the relevant circuits to achieve safety protection for the energy storage battery. In the present invention, the specific circuit structure of the BMS module is not limited as long as the corresponding functions of battery management can be achieved.

[0039] 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 floating charge voltage of the energy storage battery. The floating 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.

[0040] In the process of controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40, specifically, the energy storage battery is controlled to supply power to the external load through 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 through the unidirectional DC / AC module 40.

[0041] 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, the BMS module is connected to the bidirectional DC / DC module, and charging the battery assembly 20 includes the following steps: Controlling the photovoltaic assembly 10 to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40 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 40 .

[0042] The DC / DC module is a DC-to-DC module that can convert the input DC power into DC power output of different voltage levels. It is divided into buck type (Buck), boost type (Boost), and buck-boost type (Buck-Boost). For the buck type, when the switch is turned on, the input voltage is applied to the inductor and the load, the inductor stores energy, and the current rises; when the switch is turned off, the inductor releases energy to the load through the diode to maintain the load current. By controlling the duty cycle of the switch, the output voltage can be adjusted to achieve the buck function. For the boost type, when the switch is turned on, the input voltage charges the inductor to store energy; when the switch is turned off, the induced electromotive force generated by the inductor is superimposed on the input voltage, and the capacitor is charged and the load is powered through the diode, thereby increasing the output voltage. The output voltage can also be adjusted by controlling the duty cycle. For the buck-boost type, the principles of buck and boost are combined to achieve an output voltage that can be higher or lower than the input voltage. The bidirectional DC / DC module refers to a DC / DC module with bidirectional flow. For example, in this embodiment, power can flow from one side of the energy storage battery to the external load through the bidirectional DC / DC module, and can also flow from one side of the photovoltaic module 10 to the energy storage battery through the bidirectional DC / DC module. In the present invention, the specific circuit structure of the bidirectional DC / DC module is not limited, as long as the corresponding functions of the bidirectional DC / DC module can be realized.

[0043] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic assembly 10 is specifically controlled to charge the energy storage battery through the bidirectional DC / DC module and the BMS module. The bidirectional DC / DC module plays a role in regulating the voltage. The BMS module controls the energy storage battery so that the photovoltaic assembly 10 charges the energy storage battery.

[0044] In the process of controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40, specifically, 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. The BMS module controls the energy storage battery so that the energy storage battery supplies power to the external load through the bidirectional DC / DC module and the unidirectional DC / AC module 40. The bidirectional DC / DC module serves to regulate the voltage.

[0045] 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 control of the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40 includes the following steps: Controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module 40; The step of charging the battery assembly 20 comprises the following steps: The photovoltaic source is controlled to charge the battery assembly 20 through the MPPT module.

[0046] MPPT module, 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 perturbation observation method, incremental conductance method, 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 direction, and repeats this process, eventually stabilizing the system near the maximum power point. In the present invention, the specific circuit structure of the MPPT module is not limited, as long as the corresponding function of tracking the maximum power point in the photovoltaic system can be realized.

[0047] In the process of controlling the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40, the photovoltaic source is specifically controlled to supply power to the external load through 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 the maximum power and thus ensuring the power supply efficiency. In both the above steps 200 and 300, there is a process of controlling the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40, and the above control method can be used.

[0048] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic source is specifically controlled to charge the battery assembly 20 through the MPPT module. The MPPT module tracks the maximum power point during the charging process, thereby maintaining the maximum power and ensuring the charging efficiency.

[0049] 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 component 10, a battery component 20, a power generation component 30 and a unidirectional DC / AC module 40. The photovoltaic component 10, the battery component 20 and the power generation component 30 are connected to the unidirectional DC / AC module 40. The power generation component 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: An acquisition unit 100 is used to acquire the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20; A first control unit 200 is used 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; A second control unit 300 is used to control the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40, and control the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40 if the real-time energy is less than the first energy threshold and greater than the second energy threshold; 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 to gradually increase the output voltage of the unidirectional AC / DC module until the battery assembly 20 stops supplying power, and 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 unidirectional AC / DC module can supply power to the external load.

[0050] The DC / AC module is a DC to AC module, and its basic principle is to use power electronic conversion technology to convert DC power into AC power through an inverter circuit. The inverter circuit generally includes power switching devices (such as insulated gate bipolar transistors IGBT, metal oxide semiconductor field effect transistors MOSFET, etc.). According to a certain control strategy, these switching devices are continuously turned on and off, so as to chop and synthesize the input DC voltage, and then output AC power. The unidirectional DC / AC module 40 refers to a unidirectional DC / AC module. For example, in this embodiment, it flows from the photovoltaic component 10 side and the battery component 20 side through the unidirectional DC / AC module 40 to the external load side, and will not flow from the external load side through the unidirectional DC / AC module 40 to the photovoltaic component 10 side and the battery component 20 side, nor will it flow from the power generation component 30 side through the unidirectional DC / AC module 40 to the photovoltaic component 10 side and the battery component 20 side. In the present invention, the specific circuit structure of the unidirectional DC / AC module 40 is not limited, as long as the corresponding functions of the unidirectional DC / AC module can be realized.

[0051] AC / DC module is an AC to DC module, which is mainly composed of a rectifier, a filter and a voltage stabilizer. When working, the AC first passes through the rectifier to convert it into pulsating DC. Commonly used rectifier circuits include half-wave rectification, full-wave rectification and bridge rectification. Then, after being processed by the filter, the ripple component in the pulsating DC is filtered out and converted into a relatively smooth DC. Finally, the output voltage is stabilized by the voltage stabilizer so that it can maintain a stable DC voltage output under different load and input voltage changes. A unidirectional AC / DC module refers to an AC / DC module with unidirectional flow. For example, in this embodiment, it flows from the AC power supply side through the unidirectional AC / DC module to the external load side, and will not flow from the external load side to the AC power supply side through the unidirectional AC / DC module. In the present invention, the specific circuit structure of the unidirectional AC / DC module is not limited, as long as the corresponding function of the unidirectional AC / DC module can be realized.

[0052] refer to Figure 3 and Figure 4 , user refers to the user load, which is the external load mentioned above.

[0053] 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.

[0054] In this embodiment, the real-time energy of the photovoltaic assembly 10 and the real-time power of the battery assembly 20 are firstly obtained.

[0055] When the real-time energy of the photovoltaic component 10 is greater than the first energy threshold, it is determined that the real-time energy of the photovoltaic component 10 is sufficient, 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 sufficient, the photovoltaic component 10 is also controlled to charge the battery component 20.

[0056] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold, the real-time energy of the photovoltaic component 10 is determined to be 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.

[0057] When the real-time energy of the photovoltaic component 10 is less than the first energy threshold and greater than the second energy threshold or the real-time energy of the photovoltaic component 10 is less than the second energy threshold, and the real-time power of the battery component 20 is less than the power threshold, it is judged that the real-time energy of the photovoltaic component 10 is insufficient or extremely low or even absent, and the real-time power of the battery component 20 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 component 20 stops supplying power, and then the unidirectional DC / AC module 40 is 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 power input by the unidirectional AC / DC module 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 upward by 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.

[0058] 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.

[0059] The first energy threshold and the second energy threshold can be obtained through experience, experiment or test according to the actual situation, and then specifically set. The power threshold can be obtained through experience, experiment or test according to the actual situation, and then specifically set.

[0060] The above-mentioned 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 periodic motion at a certain moment, which reflects the relative position of the periodically changing signal relative to a reference point or reference signal. Frequency refers to the number of periodic changes per unit time, which is used to measure the speed of periodic repetitive changes of a physical quantity (such as vibration, fluctuation, current, etc.). Amplitude is also called amplitude, which refers to the maximum absolute value of the periodically changing physical quantity deviating from its equilibrium position during the change process.

[0061] In the flexible power supply device provided by the present invention, the photovoltaic assembly 10, the battery assembly 20, and the power generation assembly 30 are transformed into controllable high-voltage DC energy, and gathered together on the DC bus, and then inverted into AC output power by the unidirectional DC / AC module 40 to provide to the external load for use, thereby avoiding the direct grid connection of unstable, volatile, and time-limited energy such as solar energy, and also avoiding the requirement for the power generation assembly 30 to have an absorption capacity. In addition, since the DC bus not only gathers the electricity provided by the photovoltaic assembly 10 and the battery assembly 20, but also gathers the electricity provided by the power generation assembly 30, even when the real-time energy of the photovoltaic assembly 10 is insufficient or extremely low or even non-existent, and the energy of the battery assembly 20 is exhausted, it can still be ensured that the power generation assembly 30 supplies power to the external load, and the external load will not be powered off. 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 to disconnect the unidirectional DC / AC module 40, and the external load is directly powered by the unidirectional AC / DC module. 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.

[0062] 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: A first charging module, used for 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 floating charge voltage of the energy storage battery; The second control unit 300 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 40 .

[0063] The BMS module, or Battery Management System, is a system that monitors and controls energy storage batteries. It mainly includes the following parts: The main control unit, which is usually a microcontroller (MCU) or microprocessor (MPU), is equivalent to the "brain" of the entire BMS module, responsible for receiving data collected by various sensors, running various state estimation and control algorithms, coordinating the work of various parts, and communicating with external devices. The acquisition unit, which consists of a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit, etc., is responsible for converting the key parameters of the energy storage battery into electrical signals that can be recognized and processed by the main control unit to ensure that the collected data is accurate and reliable. The balancing circuit is a specific circuit module that realizes the balancing function of the energy storage battery. Its circuit structure varies depending on the balancing method (active balancing or passive balancing), but its purpose is to adjust the power and voltage differences between single cells. The communication interface has a variety of communication interfaces, such as CAN bus interface, RS485 interface, SPI interface or I2C interface, etc., which is convenient for exchanging data with external systems. The protection circuit is composed of various switch devices (such as relays, MOSFET, etc.), fuses, etc. When the energy storage battery is detected to be overcharged, over-discharged, over-heated, short-circuited, etc., it can quickly act to cut off the relevant circuits to achieve safety protection for the energy storage battery. In the present invention, the specific circuit structure of the BMS module is not limited as long as the corresponding functions of battery management can be achieved.

[0064] 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 floating charge voltage of the energy storage battery. The floating 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.

[0065] In the process of controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40, specifically, the energy storage battery is controlled to supply power to the external load through 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 through the unidirectional DC / AC module 40.

[0066] 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, the BMS module is connected to the bidirectional DC / DC module, and the first control unit 200 includes: A second charging module, used for controlling the photovoltaic assembly 10 to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The second control unit 300 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 40.

[0067] The DC / DC module is a DC-to-DC module that can convert the input DC power into DC power output of different voltage levels. It is divided into buck type (Buck), boost type (Boost), and buck-boost type (Buck-Boost). For the buck type, when the switch is turned on, the input voltage is applied to the inductor and the load, the inductor stores energy, and the current rises; when the switch is turned off, the inductor releases energy to the load through the diode to maintain the load current. By controlling the duty cycle of the switch, the output voltage can be adjusted to achieve the buck function. For the boost type, when the switch is turned on, the input voltage charges the inductor to store energy; when the switch is turned off, the induced electromotive force generated by the inductor is superimposed on the input voltage, and the capacitor is charged and the load is powered through the diode, thereby increasing the output voltage. The output voltage can also be adjusted by controlling the duty cycle. For the buck-boost type, the principles of buck and boost are combined to achieve an output voltage that can be higher or lower than the input voltage. The bidirectional DC / DC module refers to a DC / DC module with bidirectional flow. For example, in this embodiment, power can flow from one side of the energy storage battery to the external load through the bidirectional DC / DC module, and can also flow from one side of the photovoltaic module 10 to the energy storage battery through the bidirectional DC / DC module. In the present invention, the specific circuit structure of the bidirectional DC / DC module is not limited, as long as the corresponding functions of the bidirectional DC / DC module can be realized.

[0068] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic assembly 10 is specifically controlled to charge the energy storage battery through the bidirectional DC / DC module and the BMS module. The bidirectional DC / DC module plays a role in regulating the voltage. The BMS module controls the energy storage battery so that the photovoltaic assembly 10 charges the energy storage battery.

[0069] In the process of controlling the battery assembly 20 to supply power to the external load through the unidirectional DC / AC module 40, specifically, 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. The BMS module controls the energy storage battery so that the energy storage battery supplies power to the external load through the bidirectional DC / DC module and the unidirectional DC / AC module 40. The bidirectional DC / DC module serves to regulate the voltage.

[0070] 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: A third power supply module, used to control the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module 40; The first control unit 200 includes: The third charging module is used to control the photovoltaic source to charge the battery assembly 20 through the MPPT module.

[0071] MPPT module, 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 perturbation observation method, incremental conductance method, 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 direction, and repeats this process, eventually stabilizing the system near the maximum power point. In the present invention, the specific circuit structure of the MPPT module is not limited, as long as the corresponding function of tracking the maximum power point in the photovoltaic system can be realized.

[0072] In the process of controlling the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40, the photovoltaic source is specifically controlled to supply power to the external load through 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 the maximum power and thus ensuring the power supply efficiency. In the above-mentioned first control unit 200 and the second control unit 300, there is a process of controlling the photovoltaic assembly 10 to supply power to the external load through the unidirectional DC / AC module 40, and the above-mentioned control method can be adopted.

[0073] In the process of controlling the photovoltaic assembly 10 to charge the battery assembly 20, the photovoltaic source is specifically controlled to charge the battery assembly 20 through the MPPT module. The MPPT module tracks the maximum power point during the charging process, thereby maintaining the maximum power and ensuring the charging efficiency.

[0074] An embodiment of the present invention provides a computer device, the computer device comprising a processor, the processor being configured to implement the steps of the flexible power supply method as described above when executing a computer program stored in a memory.

[0075] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program (instructions) is stored. When the computer program (instructions) is executed by a processor, the steps of the flexible power supply method as described above are implemented.

[0076] Exemplarily, the computer program can be divided into one or more modules, one or more modules are stored in the memory and executed by the processor to complete the present invention. One or more modules can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the computer device. For example, the computer program can be divided into the steps of the flexible power supply method provided by each of the above method embodiments.

[0077] Those skilled in the art will appreciate 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, such as input and output devices, network access devices, buses, etc.

[0078] 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) or 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, etc. The processor is the control center of the computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0079] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the computer device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as an interface display function, an interface interaction function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as a map interface, a selection interface, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0080] If the module / unit integrated in the computer device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, electrical signal and software distribution medium, etc.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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 component and the real-time power of the battery component; 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 charging the battery assembly; If the real-time energy is less than the first energy threshold and greater than the second energy threshold, control the photovoltaic assembly to supply power to the external load through the unidirectional DC / AC module, and control the battery assembly to supply power to the external load through 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, and then the unidirectional DC / AC module is controlled to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally the switch is controlled to be closed and the unidirectional DC / AC module is disconnected, so that the unidirectional AC / DC module can supply power to 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 to supply power to the external load to be consistent with the floating 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, the BMS module is connected to the bidirectional DC / DC module, and 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, used for acquiring 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 through the unidirectional DC / AC module, and control the battery assembly to supply power to the external load through 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, for controlling the unidirectional AC / DC module to start, and gradually increasing 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 controlling the unidirectional DC / AC module to have the same sinusoidal wave parameters as the unidirectional AC / DC module, and finally controlling the switch to close and the unidirectional DC / AC module to disconnect, so that the unidirectional AC / DC module supplies 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, used for 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 to supply power to the external load to be consistent with the floating charge voltage of the energy storage battery; The second control unit comprises: 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, the BMS module is connected to the bidirectional DC / DC module, and the first control unit includes: A second charging module, used for controlling the photovoltaic assembly to charge the energy storage battery through the bidirectional DC / DC module and the BMS module; The second control unit comprises: 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 both include: A third power supply module, used for controlling the photovoltaic source to supply power to an external load through the MPPT module and the unidirectional DC / AC module; The first control unit comprises: 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, and the computer program can be executed to implement the steps of the flexible power supply method according to any one of claims 1 to 4.

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