Photovoltaic module flexible power point tracking method, device, equipment, medium and system

Abstract

The present invention discloses a method, apparatus, device, medium, and system for flexible power point tracking of a photovoltaic assembly. The method comprises: collecting the photovoltaic voltage and photovoltaic current output by the photovoltaic assembly at the current moment and receiving a power tracking mode instruction; when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the illumination has changed based on the photovoltaic voltage and photovoltaic current at the current moment; when the illumination has not changed, obtaining the current flexible power and determining the current global maximum power based on the photovoltaic voltage and photovoltaic current; determining the current value of a reference voltage based on the current flexible power and the current global maximum power; and generating and outputting a switching signal based on the current value of the reference voltage, the switching signal being used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic assembly. Embodiments of the present invention enable flexible operating point adjustment of the photovoltaic modules in the photovoltaic assembly under partial shading conditions, thereby improving flexibility and enhancing the stability of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power station management, and in particular to a method, device, equipment, medium and system for flexible power point tracking of photovoltaic components. Background Art

[0002] As manufacturing costs decrease, the penetration of photovoltaic systems in current power grids continues to increase. Traditional photovoltaic systems use Maximum Power Point Tracking (MPPT) technology to maximize the output energy of photovoltaic modules.

[0003] However, this approach lacks the inherent mechanical inertia of traditional synchronous generator-based power generation systems and has poor flexibility. High penetration of photovoltaic power generation will introduce low inertia characteristics to future power grids, which may cause instability in the grid. Summary of the Invention

[0004] The present invention provides a photovoltaic module flexible power point tracking method, device, equipment, medium and system to improve flexibility and thus improve the stability of the power grid.

[0005] According to one aspect of the present invention, a method for flexible power point tracking of a photovoltaic module is provided, comprising:

[0006] Collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment, and receive power tracking mode instructions;

[0007] When it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the light intensity changes according to the photovoltaic voltage and photovoltaic current at the current moment;

[0008] When the light intensity does not change, the current flexible power is obtained, and the current global maximum power is determined based on the photovoltaic voltage and photovoltaic current;

[0009] Determine the current value of the reference voltage based on the current flexible power and the current global maximum power;

[0010] According to the current value of the reference voltage, a switching signal is generated and output, and the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0011] According to another aspect of the present invention, a photovoltaic module flexible power point tracking device is provided, comprising:

[0012] The voltage and current acquisition module is used to collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment and receive power tracking mode instructions;

[0013] an illumination detection module, configured to detect whether illumination changes based on the photovoltaic voltage and photovoltaic current at a current moment when determining that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode;

[0014] The maximum power determination module is used to obtain the current flexible power when the light intensity does not change, and determine the current global maximum power based on the photovoltaic voltage and photovoltaic current;

[0015] A current value determination module, configured to determine a current value of the reference voltage based on the current flexible power and the current global maximum power;

[0016] The switch signal output module is used to generate and output a switch signal according to the current value of the reference voltage. The switch signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0017] According to another aspect of the present invention, a photovoltaic system is provided, comprising: a photovoltaic assembly, a voltage probe, a current probe, a power supply, a boost converter, and a photovoltaic assembly flexible power point tracking system for implementing the photovoltaic assembly flexible power point tracking method according to any embodiment of the present invention; the photovoltaic assembly comprises at least one photovoltaic module;

[0018] Photovoltaic modules are used to process input light and output current;

[0019] The voltage probe is connected to the photovoltaic module and is used to detect the photovoltaic voltage output by the photovoltaic module;

[0020] The current probe is connected to the photovoltaic module and is used to detect the photovoltaic current output by the photovoltaic module;

[0021] The boost converter is connected to the photovoltaic module and is used to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic module;

[0022] The power supply is connected to the boost converter and is used to provide power to the boost converter;

[0023] The photovoltaic module flexible power point tracking system is connected to the voltage probe to obtain the photovoltaic voltage output by the photovoltaic module;

[0024] The photovoltaic module flexible power point tracking system is connected to the current probe to obtain the photovoltaic current output by the photovoltaic module;

[0025] The photovoltaic module flexible power point tracking system is connected to the boost converter and is used to output a switching signal to the boost converter to control the boost converter to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic module;

[0026] The photovoltaic module flexible power point tracking system is used to receive a power tracking mode instruction and current flexible power, process and output a switching signal.

[0027] According to another aspect of the present invention, an electronic device is provided, comprising:

[0028] at least one processor; and

[0029] a memory communicatively connected to at least one processor; wherein,

[0030] The memory stores a computer program that can be executed by at least one processor. The computer program is executed by the at least one processor so that the at least one processor can execute the photovoltaic assembly flexible power point tracking method according to any embodiment of the present invention.

[0031] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions for enabling a processor to implement the photovoltaic module flexible power point tracking method according to any embodiment of the present invention when the computer instructions are executed.

[0032] The technical solution of the embodiment of the present invention collects the photovoltaic voltage and photovoltaic current output by the photovoltaic component at the current moment and receives a power tracking mode instruction; when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detects whether the light changes according to the photovoltaic voltage and photovoltaic current at the current moment; when the light does not change, obtains the current flexible power, and determines the current global maximum power according to the photovoltaic voltage and photovoltaic current; determines the current value of the reference voltage according to the current flexible power and the current global maximum power; generates and outputs a switching signal according to the current value of the reference voltage, and the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic component. The above technical solution determines the power tracking mode according to the power tracking mode instruction, and provides a variety of power tracking mode options; at the same time, it fully considers the impact of local light shading on the maximum power of the photovoltaic module, and selects the global maximum power as the basis for tracking the flexible power point, so as to realize the adjustment of the flexible power point of the photovoltaic module in the photovoltaic module under partial shading, thereby adapting to the application scenario of local light shading, realizing the photovoltaic module tracking the flexible power point, and taking into account the flexible power point tracking in the unshaded scenario, so that the photovoltaic module can maintain stable output under different working conditions, improve flexibility, and thus improve the stability of the power grid.

[0033] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1A This is a flow chart of a photovoltaic module flexible power point tracking method provided in accordance with the first embodiment of the present invention;

[0036] Figure 1B is a schematic diagram of determining a global maximum power according to a first embodiment of the present invention;

[0037] Figure 2A This is a flow chart of a photovoltaic module flexible power point tracking method provided in accordance with the second embodiment of the present invention;

[0038] Figure 2B is a schematic diagram of a method for determining a current value of a reference voltage provided according to a second embodiment of the present invention;

[0039] Figure 2C is a schematic diagram of a method for determining a current value of a reference voltage provided according to a second embodiment of the present invention;

[0040] Figure 2D is a schematic diagram of a method for determining a current value of a reference voltage provided according to a second embodiment of the present invention;

[0041] Figure 3A This is a flow chart of a photovoltaic module flexible power point tracking method provided in accordance with the third embodiment of the present invention;

[0042] Figure 3B This is a flow chart of another photovoltaic module flexible power point tracking method provided by Embodiment 3 of the present invention;

[0043] Figure 4 2 is a schematic structural diagram of a flexible power point tracking device for a photovoltaic module according to a fourth embodiment of the present invention;

[0044] Figure 5 This is a schematic structural diagram of a photovoltaic system provided according to a fifth embodiment of the present invention;

[0045] Figure 6 It is a structural diagram of an electronic device for implementing the flexible power point tracking method of a photovoltaic module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "target", "current" and "history" in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] Example 1

[0049] Figure 1A This is a flow chart of a photovoltaic module flexible power point tracking method provided in the first embodiment of the present invention. This embodiment is applicable to the case of adjusting the photovoltaic module power under partial shading condition (PSC). The method can be performed by a photovoltaic module flexible power point tracking device, which can be implemented in the form of hardware and / or software and can be configured in a photovoltaic system. Figure 1A As shown, the method includes:

[0050] S101: Collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment, and receive a power tracking mode instruction.

[0051] A photovoltaic assembly processes incoming sunlight and converts it into electrical energy. A photovoltaic assembly consists of at least one photovoltaic module, which can be connected in series to form a photovoltaic assembly. Each photovoltaic module can convert light energy into electrical energy. The photovoltaic voltage refers to the total output voltage of the photovoltaic assembly at the current moment. Accordingly, the photovoltaic voltage output by the photovoltaic assembly at the current moment can be determined using the following formula:

[0052] V pv,int =[σ ccr +σ eq (N m-int-1)]V oc0 -(N m -int)V bp ;

[0053] Among them, V pv,int Indicates the photovoltaic voltage output by the photovoltaic module at the current moment, int belongs to [1,N m ],N m Indicates the number of photovoltaic modules in the photovoltaic assembly, N m is a positive integer, σ ccr It is the proportional coefficient used to ensure operation in the constant current region (CCR) during the initialization process and is the proportional coefficient of the equivalent operating voltage of each photovoltaic module; eq The proportionality factor representing the approximate operating voltage of each photovoltaic module; V oc0 Indicates the open circuit voltage of a single photovoltaic module under standard test conditions (STC); V bp Indicates the voltage drop of the PV module bypass voltage.

[0054] The photovoltaic voltage and current can be collected periodically. The duration between the previous moment and the current moment is the sampling period.

[0055] The photovoltaic current may refer to the total output current of the photovoltaic assembly at the current moment, and may be equal to the sum of the current values of all photovoltaic modules in the photovoltaic assembly under the CCR.

[0056] The power obtained by multiplying the photovoltaic voltage and the photovoltaic current represents the electrical energy converted by the photovoltaic module from light energy.

[0057] The power tracking mode instruction is used to determine the power tracking mode, specifically to determine the power point at which the photovoltaic module operates. The power tracking mode corresponding to the power tracking mode instruction can be controlled by the value of the signal Flag. The power tracking mode can include the maximum power point tracking mode (MPPT) and the flexible power point tracking mode (Flexible Power Point Tracking, FPPT). The maximum power point tracking mode is used to obtain the maximum output power of the photovoltaic module when it operates at a certain voltage. The flexible power point tracking mode is used to adjust the output power of the photovoltaic module according to different operating conditions. For example, if Flag = 0, the maximum power point tracking mode is used; if Flag = 1, the flexible power point tracking mode is used.

[0058] Specifically, the system uses voltage probes in the photovoltaic system to collect the current photovoltaic voltage of the photovoltaic modules, and uses current probes in the photovoltaic system to collect the current photovoltaic current. Simultaneously, it receives power tracking instructions. The voltage probes in the photovoltaic system are connected to the photovoltaic modules in the photovoltaic system to detect the photovoltaic voltage output by the modules. The current probes in the photovoltaic system are connected to the photovoltaic modules in the photovoltaic system to detect the photovoltaic current output by the modules.

[0059] S102 : When it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the illumination changes according to the photovoltaic voltage and photovoltaic current at the current moment.

[0060] Specifically, when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, first detect whether the light intensity has changed. The light energy at the current moment and the light energy at the previous moment can be directly detected by the sensor, and compared to detect whether the light intensity has changed. In addition, the photovoltaic voltage V at the previous moment t-1 can also be obtained. t-1 and photovoltaic current I t-1 , V t-1 and the photovoltaic voltage V at the current moment t Compare and I t-1 The photovoltaic current I at the current moment t Compare; if V t =V t-1 And I t =I t-1 , it is determined that the illumination has not changed, otherwise, it is determined that the illumination has changed. Wherein, t is a positive integer.

[0061] Optionally, the detection of whether the light changes based on the photovoltaic voltage and photovoltaic current at the current moment can be: calculating the photovoltaic power at the current moment based on the photovoltaic voltage and photovoltaic current at the current moment; obtaining the photovoltaic power at the historical moment; comparing the photovoltaic power at the current moment with the photovoltaic power at the historical moment to detect whether the light changes.

[0062] PV power represents the power generation capacity of a PV module. The current PV power is equal to the product of the current PV voltage and the current PV current. A historical moment can refer to a moment before the current moment, without specific limitations. Specifically, a historical moment can refer to the moment immediately preceding the current moment in the sampling period.

[0063] Specifically, the product of the current photovoltaic voltage and current is calculated and used as the current photovoltaic power. Similarly, the photovoltaic power at the historical moment is obtained based on the photovoltaic voltage and current at the historical moment. If the current photovoltaic power is equal to the historical photovoltaic power, it is determined that there is no change in light intensity; otherwise, it is determined that there is a change in light intensity. This provides a specific light detection method that can more accurately detect the light intensity of photovoltaic modules and avoids the need for multiple light energy detection sensors. This reduces the cost of detecting light intensity changes, simplifies the detection process, and improves the efficiency of light intensity change detection.

[0064] S103 . When the illumination does not change, obtain the current flexible power, and determine the current global maximum power based on the photovoltaic voltage and the photovoltaic current.

[0065] The current flexible power represents the current power generation capacity of the PV panel in flexible power point tracking mode. The current flexible power can be preset and provided by the user. The current global maximum power (GMPP) refers to the maximum power of the PV modules in the PV panel at the current moment and represents the maximum power generation capacity of the PV panel at the current moment.

[0066] Specifically, at least one peak power, that is, at least one maximum power (MMP), is obtained based on the photovoltaic voltage and the photovoltaic current, and the maximum value is selected from the at least one MMP to determine it as the GMPP. In a scene without shadows, there is only one MMP. In a scene with partial shadows, there may be multiple MMPs or only one MMP. The embodiment of the present invention can be applied to scenes with partial shadows. For scenes with multiple MMPs, the maximum value GMPP can be selected from them as a reference value for power tracking of the flexible power point. However, most existing power tracking solutions have never considered scenes with partial shadows.

[0067] In addition, in a scene without shadows, there is only one MMP, which is the GMPP. Therefore, the method provided by the embodiment of the present invention is also suitable for application scenes without shadows.

[0068] For example, see Figure 1B , GMPP represents the current global maximum power point, MPP represents the current maximum power point, FPP represents the current flexible power point, and IP represents the inflection point in the current power curve. Figure 1B The power point of the scene with partial shadow is shown. In fact, partial shadow causes Figure 1B There are multiple MMPs in the GMPP. The maximum value among the multiple MMPs is GMPP. When the illumination does not change, obtain the current flexible power (denoted as Pfpp ), and according to the photovoltaic voltage and photovoltaic current, draw the power curve of the photovoltaic module under the photovoltaic voltage and photovoltaic current; take the maximum value in the power curve as the current global maximum power (denoted as P gmpp ).

[0069] Optionally, determining the current global maximum power based on the photovoltaic voltage and photovoltaic current may be: obtaining the short-circuit current of the photovoltaic module; the photovoltaic assembly includes at least one photovoltaic module; calculating the ratio between the photovoltaic current and the short-circuit current at the current moment to obtain the illumination value of the photovoltaic assembly at the current moment; detecting the current maximum power point of each photovoltaic module included in the photovoltaic assembly based on the illumination value of the photovoltaic assembly at the current moment; and determining the current global maximum power of the photovoltaic assembly based on the current maximum power point of each photovoltaic module included in the photovoltaic assembly.

[0070] The short-circuit current can refer to the current output by a photovoltaic module when the circuit in the power system is abnormally connected. The light value can refer to the light energy absorbed by the photovoltaic module. It should be noted that the short-circuit current of each photovoltaic module in the photovoltaic assembly is the same.

[0071] Specifically, under STC, the short-circuit current of a single photovoltaic module in the photovoltaic assembly is obtained, which is recorded as I sc0 For each photovoltaic module in the photovoltaic assembly, calculate the ratio between the photovoltaic current and the short-circuit current at the current moment to obtain the illumination value of the photovoltaic module at the current moment. Correspondingly, the illumination value of the photovoltaic module at the current moment can be obtained by the following formula:

[0072] E pv,int =I pv,int / I sc0 ;

[0073] Among them, I pv,int Indicates the photovoltaic current of the intth photovoltaic module in the photovoltaic assembly under CCR at the current moment, E pv,int Indicates the illumination value of the intth photovoltaic module in the photovoltaic assembly at the current moment; int belongs to [1,N m ],N m Indicates the number of photovoltaic modules in the photovoltaic assembly, N m is a positive integer. Similarly, the illumination values of all photovoltaic modules in the photovoltaic assembly can be obtained, and the sum of the illumination values of each photovoltaic module in the photovoltaic assembly is used as the illumination value of the photovoltaic assembly at the current moment. Based on the illumination value of the photovoltaic assembly at the current moment, the current maximum power point of each photovoltaic module included in the photovoltaic assembly is detected. The current maximum power point (MPP) corresponding to each photovoltaic module can be determined using the following formula:

[0074]

[0075] Among them, V mpp,j represents the voltage corresponding to the MPP of the jth photovoltaic module, I mpp,j represents the current corresponding to the MPP of the jth photovoltaic module, P mpp,j represents the power corresponding to the MPP of the jth photovoltaic module, N i Indicates the PV module at irradiance level E pv,i The number of E pv,i represents the illumination value of the ith photovoltaic module at the current moment, V bp Represents the voltage drop of the photovoltaic module bypass voltage, V mpp0 represents the voltage corresponding to the MPP of the jth photovoltaic module under STC, I mpp0 represents the current corresponding to the MPP of the jth photovoltaic module under STC, V oc0 It represents the open circuit voltage of a single photovoltaic module under STC, λ is an empirical coefficient with a typical value of 0.06, N m Indicates the number of photovoltaic modules in the photovoltaic assembly, N m Is a positive integer.

[0076] Furthermore, the maximum value among the current maximum power points of each photovoltaic module included in the photovoltaic assembly is determined as the current global maximum power of the photovoltaic assembly. A method for determining the current global maximum power of a photovoltaic assembly is provided, which improves the accuracy of the current global maximum power of the photovoltaic assembly and, in turn, improves the accuracy of the current reference voltage value.

[0077] S104: Determine a current value of the reference voltage according to the current flexible power and the current global maximum power.

[0078] The reference voltage may refer to a voltage used for reference, and the current value may refer to the value of the reference voltage at the current moment.

[0079] Specifically, the current flexible power is compared with the current global maximum power; if the current flexible power is less than the current global maximum power, it indicates that within the conversion capacity of the photovoltaic module, the maximum value of the power output by the photovoltaic module can reach the current flexible power, and the current flexible voltage corresponding to the current flexible power is determined as the current value of the reference voltage; if the current flexible power is greater than or equal to the current global maximum power, it indicates that within the conversion capacity of the photovoltaic module, the maximum value of the power output by the photovoltaic module cannot reach the current flexible power, and it can only be as close to the current flexible power as possible, and the current global maximum voltage corresponding to the current global maximum power is determined as the current value of the reference voltage.

[0080] S105 . Generate and output a switching signal according to the current value of the reference voltage, where the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0081] The switching signal may be a pulse width modulation signal (PWM boost ), used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0082] Specifically, the current value of the reference voltage is input into the pulse width modulation comparator, and then the switching signal is generated and output according to the current value of the reference voltage in the pulse width modulation comparator.

[0083] The technical solution of the embodiment of the present invention collects the photovoltaic voltage and photovoltaic current output by the photovoltaic component at the current moment and receives a power tracking mode instruction; when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detects whether the light changes according to the photovoltaic voltage and photovoltaic current at the current moment; when the light does not change, obtains the current flexible power, and determines the current global maximum power according to the photovoltaic voltage and photovoltaic current; determines the current value of the reference voltage according to the current flexible power and the current global maximum power; generates and outputs a switching signal according to the current value of the reference voltage, and the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic component. The above technical solution determines the power tracking mode according to the power tracking mode instruction, and provides a variety of power tracking mode options; at the same time, it fully considers the impact of local light shading on the maximum power of the photovoltaic module, and selects the global maximum power as the basis for tracking the flexible power point, so as to realize the adjustment of the flexible power point of the photovoltaic module in the photovoltaic module under partial shading, thereby adapting to the application scenario of local light shading, realizing the photovoltaic module tracking the flexible power point, and taking into account the flexible power point tracking in the unshaded scenario, so that the photovoltaic module can maintain stable output under different operating conditions, improve flexibility, and thus improve the stability of the power grid.

[0084] Example 2

[0085] Figure 2A This is a flowchart of a photovoltaic module flexible power point tracking method provided in the second embodiment of the present invention. Based on the above embodiment, this embodiment further refines "determining the current value of the reference voltage based on the current flexible power and the current global maximum power" into: "obtaining the historical flexible power at the historical moment; calculating the difference between the current flexible power and the historical flexible power, and determining it as the flexible power change value; comparing the current flexible power with the current global maximum power; determining the target value and update method of the reference voltage based on the comparison result and the flexible power change value; determining the current value of the reference voltage based on the target value and update method of the reference voltage", and provides an optional implementation plan. It should be noted that for the parts not described in detail in the embodiments of the present invention, please refer to the relevant statements of other embodiments. Figure 2A As shown, the method includes:

[0086] S201: Collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment, and receive a power tracking mode instruction.

[0087] S202 : When it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the illumination changes according to the photovoltaic voltage and photovoltaic current at the current moment.

[0088] S203 : When the illumination does not change, obtain the current flexible power, and determine the current global maximum power according to the photovoltaic voltage and the photovoltaic current.

[0089] S204: Obtain historical flexible power at a historical moment.

[0090] The historical moment may refer to a moment before the current moment, without specific limitation. The historical flexible power may refer to the flexible power of the photovoltaic module at a historical moment. Specifically, the historical moment may refer to the moment immediately preceding the current moment in the sampling period.

[0091] Specifically, the historical flexible power corresponding to the historical moment is obtained from the flexible power historical usage table, wherein the flexible power historical usage table is used to record the historical flexible power corresponding to the historical moment.

[0092] S205: Calculate the difference between the current flexible power and the historical flexible power, and determine it as the flexible power change value.

[0093] The flexible power change value is used to reflect the change of flexible power. It can be obtained by calculating the difference between the current flexible power and the historical flexible power, which is recorded as dP. fpp .

[0094] Specifically, if the current flexible power is less than the historical flexible power, the flexible power change value dP fpp = equal to the historical flexible power minus the current flexible power; otherwise, the flexible power change value dP fpp Equal to the current flexible power minus the historical flexible power.

[0095] S206: Compare the current flexible power with the current global maximum power.

[0096] Specifically, compare the current flexible power P fpp and the current global maximum power P gmpp size.

[0097] S207 : Determine a target value and an updating method of the reference voltage according to the comparison result and the flexible power change value.

[0098] Among them, the comparison results include P fpp >P gmpp and P fpp≤P gmpp There are two results. The target value can be the required value of the reference voltage. The update mode can refer to the update mode of the reference voltage target value; the update mode can include a fast update mode and a high-precision update mode.

[0099] Specifically, the flexible power change value dP fpp Compared with the preset change threshold (denoted as dP fpp,th ) for comparison; if dP fpp >dP fpp,th , and the comparison result is P fpp >P gmpp , then according to the current global maximum power P gmpp , determine the target value and update method of the reference voltage; if dP fpp >dP fpp,th , and the comparison result is P fpp ≤P gmpp , then according to the current flexible power P fpp , determine the target value and update method of the reference voltage. fpp ≤dP fpp,th , and the comparison result is P fpp >P gmpp , then according to the current global maximum power P gmpp , determine the target value and update method of the reference voltage; if dP fpp ≤dP fpp,th , and the comparison result is P fpp ≤P gmpp , then according to P fpp , determine the target value and update method of the reference voltage. Among them, the preset change threshold dP fpp,th It is used to detect whether the change of the flexible power change value is too large, so as to detect the corresponding update method, and can be preset based on experience.

[0100] Optionally, when the current flexible power is less than or equal to the current global maximum power, the target value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the current flexible power is greater than the current global maximum power, the target value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power.

[0101] Specifically, if dP fpp >dP fpp,th , and the comparison result is P fpp >P gmpp , then the target value of the reference voltage is determined to be the current global maximum voltage V corresponding to the current global maximum power gmpp , and then determine the update method of the reference voltage according to the target value of the reference voltage; if dP fpp >dP fpp,th, and the comparison result is P fpp ≤P gmpp , then the target value of the reference voltage is determined to be the current flexible voltage V corresponding to the current flexible power fpp , and then determine the update method of the reference voltage according to the target value of the reference voltage. fpp ≤dP fpp,th , and the comparison result is P fpp >P gmpp , then the target value of the reference voltage is determined to be the current global maximum voltage V corresponding to the current global maximum power gmpp , and then determine the update method of the reference voltage according to the target value of the reference voltage; if dP fpp ≤dP fpp,th , and the comparison result is P fpp ≤P gmpp , then the target value of the reference voltage is determined to be the current flexible voltage V corresponding to the current flexible power fpp The reference voltage update method is then determined based on the target reference voltage value. This operation, within the PV module's conversion capabilities, determines the target reference voltage value based on a comparison of the current flexible power and the current global maximum power. This ensures accurate power output from the PV module, while also minimizing power oscillations.

[0102] For example, Figure 2B and Figure 2C As shown, in P fpp ≤P gmpp When the target value of the reference voltage V is determined pv The current flexible voltage V corresponding to the current flexible power fpp Correspondingly, the reference power P corresponding to the reference voltage target value pv V fpp The corresponding current flexible power P fpp , the reference current I corresponding to the reference voltage target value pv V fpp The corresponding current flexible current; such as Figure 2D As shown, in P fpp >P gmpp When the target value of the reference voltage V is determined pv The current global maximum voltage V corresponding to the current global maximum power gmpp Correspondingly, the reference power P corresponding to the reference voltage target value pv V gmpp The corresponding current global maximum power P gmpp , the reference current I corresponding to the reference voltage target value pv V gmpp The corresponding current global maximum current.

[0103] Optionally, when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is greater than the preset change threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is less than or equal to the preset change threshold, the update mode of the reference voltage is determined to be the high-precision update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is greater than the preset difference threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is less than or equal to the preset difference threshold, the update mode of the reference voltage is determined to be the high-precision update mode.

[0104] The preset change threshold is used to detect whether the change of the flexible power change value is too large, so as to detect the corresponding update method. The preset difference threshold is used to detect whether the difference between the current photovoltaic voltage and the current global maximum voltage is too large, so as to detect the corresponding update method. It can be pre-set based on experience and recorded as dV th . Usually, a certain update method is used when the gap is small, and another update method is used when the gap is large. For the embodiment of the present invention, a high-precision update method is used when the gap is small, and a fast update method is used when the gap is large. Among them, the fast update method is a one-step update method, which can specifically refer to a method of directly using the current flexible voltage corresponding to the current flexible power or the current global maximum voltage corresponding to the current global maximum power as the reference voltage target value. The high-precision update method can refer to an update method that obtains the reference voltage target value step by step through precise calculation based on the current flexible power or the current global maximum power. The update speed of the high-precision update method is slower than that of the fast update method. The high-precision update method uses an iterative method to obtain the reference voltage target value step by step through precise calculation, and is therefore called a high-precision update method. The high-precision update method is more suitable for situations where the flexible power change value changes little or the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is small. Correspondingly, the fast update method is more suitable for situations where the flexible power change value changes greatly or the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is large.

[0105] Specifically, in dP fpp >dP fpp,th , and the target value of the reference voltage is V fppWhen dP is set, the reference voltage is updated in the fast update mode. fpp ≤dP fpp,th , and the target value of the reference voltage is V fpp When dP is set, the reference voltage is updated in high-precision mode. fpp >dP fpp,th or dP fpp ≤dP fpp,th , and the target value of the reference voltage is V gmpp Calculate the photovoltaic voltage at the current moment (denoted as V pv ) corresponds to the current global maximum voltage V gmpp The difference between them is recorded as dV=|V pv -V gmpp |, if the difference is greater than the preset difference threshold, that is, dV>dV th , the reference voltage is updated in a fast update mode; otherwise, the reference voltage is updated in a high-precision update mode. This provides a reference voltage update method when the target values of the reference voltage are the current flexible voltage corresponding to the current flexible power and the current global maximum voltage corresponding to the current global maximum power, making reference voltage adjustment more flexible and accurate.

[0106] S208 : Determine the current value of the reference voltage according to the target value and update method of the reference voltage.

[0107] The current value may refer to the value of the reference voltage at the current moment.

[0108] Specifically, the target value of the reference voltage and the current value calculation method of the reference voltage under the corresponding update method are preset, and the current value of the reference voltage is determined according to the calculation method. For example, the target value of the reference voltage is preset to V fpp , and when the reference voltage is updated in fast update mode, the current value of the reference voltage is the target value of the reference voltage, then the current value of the reference voltage is determined to be V fpp .

[0109] S209 : Generate and output a switching signal according to the current value of the reference voltage, where the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0110] The technical solution of the embodiment of the present invention obtains the historical flexible power at a historical moment; calculates the difference between the current flexible power and the historical flexible power to determine the flexible power change value; compares the current flexible power with the current global maximum power; determines the target value and update method of the reference voltage based on the comparison result and the flexible power change value; and determines the current value of the reference voltage based on the target value and update method of the reference voltage. The above technical solution ensures the flexible output of power of the photovoltaic module under partial shadow shielding conditions, determines the current value of the reference voltage based on the target value and update method of the reference voltage under different operating conditions, improves the accuracy of the calculation of the current value of the reference voltage, and facilitates the subsequent generation and output of a more accurate switching signal based on the current value of the reference voltage to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module, ensuring the stable operation of the photovoltaic module under different operating conditions.

[0111] Example 3

[0112] Figure 3A This is a flowchart of a photovoltaic module flexible power point tracking method provided in the third embodiment of the present invention. Based on the above embodiment, this embodiment further refines "determining the current value of the reference voltage according to the target value and update method of the reference voltage" as follows: "When the target value of the reference voltage is the flexible voltage corresponding to the current flexible power, and the update method of the reference voltage is the fast update method, the current value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, and the update method of the reference voltage is the high-precision update method, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the preset step voltage of the first symbol, and the first symbol is determined according to the power and the current moment. The comparison result between the current flexible power is determined; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, and the update mode of the reference voltage is a fast update mode, the current value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, and the update mode of the reference voltage is a high-precision update mode, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the step voltage of the second symbol, and the second symbol is determined according to the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment". An optional implementation scheme is provided. It should be noted that for the parts not described in detail in the embodiments of the present invention, reference can be made to the relevant statements of other embodiments. For example Figure 3A As shown, the method includes:

[0113] S301: Collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment, and receive a power tracking mode instruction.

[0114] S302: When it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the illumination changes according to the photovoltaic voltage and photovoltaic current at the current moment.

[0115] S303 : When the illumination does not change, obtain the current flexible power, and determine the current global maximum power according to the photovoltaic voltage and the photovoltaic current.

[0116] S304: Obtain historical flexible power at historical moments.

[0117] S305: Calculate the difference between the current flexible power and the historical flexible power, and determine it as the flexible power change value.

[0118] S306: Compare the current flexible power with the current global maximum power.

[0119] S307 : Determine a target value and an updating method of the reference voltage according to the comparison result and the flexible power change value.

[0120] Specifically, when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update method of the reference voltage is the fast update method, execute S308; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update method of the reference voltage is the high-precision update method, execute S309; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update method of the reference voltage is the fast update method, execute S310; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update method of the reference voltage is the high-precision update method, execute S311.

[0121] Furthermore, when the current flexible power is less than or equal to the current global maximum power, the target value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the current flexible power is greater than the current global maximum power, the target value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power.

[0122] Furthermore, when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is greater than the preset change threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is less than or equal to the preset change threshold, the update mode of the reference voltage is determined to be the high-precision update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is greater than the preset difference threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is less than or equal to the preset difference threshold, the update mode of the reference voltage is determined to be the high-precision update mode.

[0123] S308: When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the reference voltage update mode is the fast update mode, determine that the current value of the reference voltage is the current flexible voltage corresponding to the current flexible power. Then, execute S312.

[0124] Specifically, when the target value of the reference voltage is the current flexible voltage V corresponding to the current flexible power, fpp , and the reference voltage update mode is fast update mode, the target value of the reference voltage is used as the current value of the reference voltage, that is, the current value of the reference voltage is V fpp .

[0125] S309: When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the reference voltage is updated in a high-precision update mode, the current value of the reference voltage is determined to be a fusion result of the historical value of the reference voltage and a preset step voltage of a first symbol, where the first symbol is determined based on a comparison result between the current power and the current flexible power. Then, S312 is executed.

[0126] The historical value may refer to the voltage value of the reference voltage at a historical moment. The historical moment may refer to a moment before the current moment, without specific limitation. The preset step voltage may be preset and used to adjust the historical value of the reference voltage. The first sign may refer to the sign of the difference between the current power and the current flexible power multiplied by the negative sign. The fusion result may refer to the sum of the historical value of the reference voltage and the preset step voltage of the first sign.

[0127] Specifically, when the target value of the reference voltage is the current flexible voltage V corresponding to the current flexible power, fpp, and when the reference voltage is updated in a high-precision update mode, the fusion result between the historical value of the reference voltage and the preset step voltage of the first symbol is calculated, and the fusion result is used as the current value of the reference voltage. Accordingly, the current value of the reference voltage can be expressed by the following formula:

[0128] V pv,ref =V pv,ref,old +sign(P pv -P fpp )V step ;

[0129] Among them, V pv,ref Indicates the current value of the reference voltage, V pv,ref,old Indicates the historical value of the reference voltage, sign(P pv -P fpp )V step Represents the preset step voltage of the first symbol, P pv Indicates the power at the current moment, P fpp Indicates the current flexible power.

[0130] S310 : When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the reference voltage update mode is the fast update mode, determine that the current value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power. Then, execute S312 .

[0131] Specifically, when the target value of the reference voltage is the current global maximum voltage V corresponding to the current global maximum power gmpp , and when the reference voltage is updated in a fast update mode, the target value of the reference voltage is used as the current value of the reference voltage, that is, the current value of the reference voltage is determined to be V gmpp .

[0132] S311: When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the reference voltage is updated in a high-precision update mode, determine that the current value of the reference voltage is a fusion result of the historical value of the reference voltage and a preset step voltage of a second symbol, where the second symbol is determined based on the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment. Then, execute S312.

[0133] Among them, the power P at the current moment pv The power of historical moments pv,old The difference between dP pv , can be expressed by the following formula:

[0134] dP pv =P pv -Ppv,old ;

[0135] The photovoltaic voltage V at the current moment pv and the photovoltaic voltage V at the historical moment pv,old The difference between dV pv , can be expressed by the following formula:

[0136] dV pv =V pv -V pv,old ;

[0137] The second symbol may refer to dP pv Symbol and dV pv The fusion result may be the sum of the historical value of the reference voltage and the preset step voltage of the second symbol.

[0138] Specifically, when the target value of the reference voltage is the current global maximum voltage V corresponding to the current global maximum power gmpp , and when the reference voltage is updated in a fast update mode, the fusion result between the historical value of the reference voltage and the step voltage of the second symbol is calculated, and the fusion result is used as the current value of the reference voltage. Accordingly, the current value of the reference voltage can be expressed by the following formula:

[0139]

[0140] Among them, V pv,ref Indicates the current value of the reference voltage, V pv,ref,old Indicates the historical value of the reference voltage, sign(dV pv )V step Indicates the preset step voltage of the second symbol, dP pv Indicates the power P at the current moment pv The power of historical moments pv,old The difference between pv Indicates the photovoltaic voltage V at the current moment pv and the photovoltaic voltage V at the historical moment pv,old The difference between .

[0141] S312 . Generate and output a switching signal according to the current value of the reference voltage, where the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0142] The technical solution of the embodiment of the present invention determines the current value of the reference voltage according to the target value and update method of the reference voltage under different operating conditions, provides multiple calculation methods of the current value of the reference voltage, provides flexibility in calculating the current value of the reference voltage, and realizes targeted calculation of the current value of the reference voltage, thereby improving the accuracy of the current value of the reference voltage under different operating conditions, making the generated switching signal more accurate.

[0143] Based on the above embodiments, as an optional manner of the embodiments of the present invention, the method may further include: obtaining the illumination value of the photovoltaic component at the current moment; calculating the product between the illumination value of the photovoltaic component at the current moment and the short-circuit current of the photovoltaic module; calculating the ratio between the current flexible power and the product, and determining it as an alternative current flexible voltage; screening out the voltage between the current inflection point voltage and the current maximum voltage from the alternative current flexible voltages, and determining it as the current flexible voltage corresponding to the current flexible power.

[0144] The illumination value is used to quantify the solar energy absorbed by the photovoltaic module. The short-circuit current may refer to the current output when the circuit in the power system is abnormally connected. The alternative current flexible voltage may refer to the current flexible voltage that can be selected. The current inflection point voltage may refer to the voltage corresponding to the inflection point in the output curve of the photovoltaic module at the current moment. Taking into account the conduction state of the bypass diode in the PSC situation, the voltage, current, and power corresponding to the current inflection point can be expressed by the following formula:

[0145]

[0146] Among them, V ip,j Indicates the voltage corresponding to the j-th inflection point, j is a positive integer, I ip,j represents the current corresponding to the j-th inflection point, P ip,j Indicates the power corresponding to the j-th inflection point, E pv,j+1 Indicates the illumination value corresponding to the j+1th inflection point, I sc0 Indicates the short-circuit current of a single photovoltaic module under STC, N i Indicates the PV module at irradiance level E pv,j The number of V bp Represents the voltage drop of the photovoltaic module bypass voltage, V T Represents thermal voltage, V op,i(i+1) Indicates the voltage of the current operating point that falls between the voltage range of photovoltaic module i and photovoltaic module i+1, I ph,i Represents the photovoltaic current of photovoltaic module i, I s Represents the reverse saturation current of the diode in the photovoltaic module, I ph,i+1 Represents the photovoltaic current of photovoltaic module i+1.

[0147] Specifically, obtain the illumination value E of the photovoltaic module at the current moment pv ; Calculate the illumination value E of the photovoltaic module at the current moment pv The short-circuit current I of the photovoltaic module sc0 The product between them; calculate the current flexible power P fpp The ratio between the current flexible voltage V fpp,intAccordingly, the alternative current flexible voltage can be determined by the following formula:

[0148] V fpp,int =P fpp / (E pv I sc0 ),V fpp,int ∈(V ip,int ,V mpp,int ];

[0149] Among them, V ip,int Indicates the current knee point voltage, V mpp,int Indicates the current maximum voltage at the current inflection point. The voltage between the current inflection point voltage and the current maximum voltage is screened out from the alternative current flexible voltages and determined as the current flexible voltage corresponding to the current flexible power. The above operation determines the alternative current flexible voltage based on the current illumination value of the photovoltaic component, the short-circuit current of the photovoltaic module, and the current flexible power. There is no need to use a sensor to collect the current illumination value of the photovoltaic component, which reduces costs and improves the efficiency of determining the alternative current flexible voltage. At the same time, the voltage between the current inflection point voltage and the current maximum voltage is screened out from the alternative current flexible voltages and used as the current flexible voltage, ensuring that the current flexible voltage is within a reasonable range, thereby ensuring the safety of the output voltage of the photovoltaic component.

[0150] In addition, when the power tracking mode corresponding to the power tracking mode instruction is the maximum power point tracking mode, the current global maximum power is calculated using the following formula:

[0151] P gmpp =I pv ·V pv ;

[0152] Among them, P gmpp Indicates the current global maximum power, I pv Indicates the photovoltaic current output by the photovoltaic module at the current moment, V pv Represents the photovoltaic voltage output by the photovoltaic module at the current moment. The current global maximum power is then used to determine the current global maximum voltage. Based on the current global maximum voltage, the current value of the reference voltage is determined as the result of combining the historical value of the reference voltage with the preset step voltage of the second symbol. The second symbol is based on the difference between the current power and the historical power, as well as the difference between the current photovoltaic voltage and the historical photovoltaic voltage.

[0153] Based on the above embodiments, a preferred technical solution is provided, such as Figure 3B The flowchart of another flexible power point tracking method for photovoltaic modules shown in FIG. 1 specifically includes:

[0154] S320, collecting the photovoltaic voltage V output by the photovoltaic module at the current moment pv and photovoltaic current I pv .

[0155] S321 , detecting the number of photovoltaic modules in the photovoltaic assembly, that is, detecting whether int is equal to 0; if so, executing S322 , otherwise executing S320 .

[0156] Specifically, when int=0, execute S322, otherwise execute S320 to reinitialize the photovoltaic voltage V output by the Kung Fu component at the current moment. pv and photovoltaic current I pv .

[0157] S322, calculate the illumination value E corresponding to each photovoltaic module of the photovoltaic assembly pv,int .

[0158] S323. Calculate the key operating points of photovoltaic modules.

[0159] Specifically, according to the illumination value corresponding to each photovoltaic module of the photovoltaic assembly, the maximum power point MPP, the flexible power point FPP and the inflection point IP corresponding to each photovoltaic module are calculated.

[0160] S324 , detect the value of the signal Flag; if Flag=0, execute S325 ; if Flag=1, execute S328 .

[0161] S325: When the power tracking mode corresponding to the power tracking mode instruction is the maximum power point tracking mode, obtain the current global maximum power P gmpp .

[0162] S326. When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update method of the reference voltage is a high-precision update method, determine that the current value of the reference voltage is a fusion result between the historical value of the reference voltage and the preset step voltage of the second symbol.

[0163] The second sign is determined according to the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment.

[0164] S327 . Generate and output a switching signal according to the current value of the reference voltage.

[0165] The switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0166] S328: When the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detect whether the illumination changes. If so, execute S320; otherwise, execute S329.

[0167] Specifically, the photovoltaic power at the current moment is calculated based on the photovoltaic voltage and photovoltaic current at the current moment; the photovoltaic power at the historical moment is obtained; the photovoltaic power at the current moment is compared with the photovoltaic power at the historical moment to detect whether the light intensity has changed. If the light intensity has changed, S320 is executed to reinitialize the photovoltaic voltage V output by the Kung Fu component at the current moment. pv and photovoltaic current I pv , otherwise execute S329.

[0168] S329, obtain flexible power change value dP fpp and compare it with the preset change threshold dP fpp,th Perform a comparison; regardless of the comparison result, execute S330.

[0169] Specifically, the difference between the current flexible power and the historical flexible power is calculated and used as the flexible power change value dP fpp ; Change the flexible power value dP fpp and the preset change threshold dP fpp,th Make comparisons;

[0170] S330, the current flexible power P fpp and the current global maximum power P gmpp Compare; if P fpp ≤P gmpp , then execute S331; if P fpp >P gmpp , then execute S333.

[0171] S331, when the current flexible power is less than or equal to the current global maximum power, that is, when P fpp ≤P gmpp When , the target value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power.

[0172] Optionally, when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is greater than the preset change threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is less than or equal to the preset change threshold, the update mode of the reference voltage is determined to be the high-precision update mode.

[0173] S332: Determine the current value of the reference voltage according to the target value and update mode of the reference voltage. Then, execute S327.

[0174] Specifically, when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update mode of the reference voltage is the fast update mode, the current value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update mode of the reference voltage is the high-precision update mode, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the preset step voltage of the first symbol, and the first symbol is determined based on the comparison result between the power at the current moment and the current flexible power; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update mode of the reference voltage is the fast update mode, the current value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update mode of the reference voltage is the high-precision update mode, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the preset step voltage of the second symbol, and the second symbol is determined based on the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment.

[0175] S333, when the current flexible power is greater than the current global maximum power, that is, when P fpp >P gmpp When , the target value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power.

[0176] S334: Compare the difference dV between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power with the preset difference threshold dV th Compare; if dV>dV th , then execute S335, otherwise execute S336.

[0177] S335: When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the current photovoltaic voltage and the current global maximum voltage corresponding to the current global maximum power is greater than a preset difference threshold, determine that the reference voltage update mode is the fast update mode. Then, execute S332.

[0178] S336: When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the current photovoltaic voltage and the current global maximum voltage corresponding to the current global maximum power is less than or equal to a preset difference threshold, determine that the reference voltage update mode is the high-precision update mode. Then, execute S332.

[0179] It should be noted that, for parts not described in detail in the embodiments of the present invention, reference may be made to relevant descriptions in other embodiments.

[0180] Example 4

[0181] Figure 4 This is a schematic diagram of the structure of a flexible power point tracking device for photovoltaic modules provided by the fourth embodiment of the present invention. This embodiment is applicable to the situation where the power of photovoltaic modules is adjusted under partial shadow. The device can be implemented in the form of hardware and / or software and can be configured in a photovoltaic system. Figure 4 As shown, the device includes:

[0182] The voltage and current acquisition module 401 is used to acquire the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment and receive a power tracking mode instruction;

[0183] The light detection module 402 is used to detect whether the light changes according to the photovoltaic voltage and photovoltaic current at the current moment when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode;

[0184] The maximum power determination module 403 is used to obtain the current flexible power when the illumination does not change, and determine the current global maximum power based on the photovoltaic voltage and photovoltaic current;

[0185] A current value determination module 404 is configured to determine a current value of the reference voltage based on the current flexible power and the current global maximum power;

[0186] The switch signal output module 405 is used to generate and output a switch signal according to the current value of the reference voltage, and the switch signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic module.

[0187] The technical solution of the embodiment of the present invention is to collect the photovoltaic voltage and photovoltaic current output by the photovoltaic component at the current moment through the voltage and current acquisition module, and receive the power tracking mode instruction; through the light detection module, when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detect whether the light changes according to the photovoltaic voltage and photovoltaic current at the current moment; through the maximum power determination module, when there is no change in the light, obtain the current flexible power, and determine the current global maximum power according to the photovoltaic voltage and photovoltaic current; through the current value determination module, determine the current value of the reference voltage according to the current flexible power and the current global maximum power; through the switch signal output module, generate and output the switch signal according to the current value of the reference voltage, and the switch signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic component. The above technical solution determines the power tracking mode according to the power tracking mode instruction, and provides a variety of power tracking mode options; at the same time, it fully considers the impact of local light shading on the maximum power of the photovoltaic module, and selects the global maximum power as the basis for tracking the flexible power point, so as to realize the adjustment of the flexible power point of the photovoltaic module in the photovoltaic module under partial shading, thereby adapting to the application scenario of local light shading, realizing the photovoltaic module tracking the flexible power point, and taking into account the flexible power point tracking in the unshaded scenario, so that the photovoltaic module can maintain stable output under different operating conditions, improve flexibility, and thus improve the stability of the power grid.

[0188] Optionally, the current value determination module 404 includes:

[0189] A flexible power acquisition unit, used to acquire historical flexible power at historical moments;

[0190] a change value determining unit, configured to calculate a difference between the current flexible power and the historical flexible power, and determine the difference as the flexible power change value;

[0191] A power comparison unit, configured to compare the current flexible power with the current global maximum power;

[0192] a target value and update mode determination unit, configured to determine a target value and an update mode of the reference voltage according to the comparison result and the flexible power variation value;

[0193] The current value determining unit is used to determine the current value of the reference voltage according to the target value and the updating mode of the reference voltage.

[0194] Optionally, the target value and update mode determination unit is specifically configured to:

[0195] When the current flexible power is less than or equal to the current global maximum power, the target value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the current flexible power is greater than the current global maximum power, the target value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power.

[0196] Optionally, the target value and update mode determination unit is further configured to:

[0197] When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is greater than the preset change threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is less than or equal to the preset change threshold, the update mode of the reference voltage is determined to be the high-precision update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is greater than the preset difference threshold, the update mode of the reference voltage is determined to be the fast update mode; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is less than or equal to the preset difference threshold, the update mode of the reference voltage is determined to be the high-precision update mode.

[0198] Optionally, the current value determination unit is specifically configured to:

[0199] When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update mode of the reference voltage is the fast update mode, the current value of the reference voltage is determined to be the current flexible voltage corresponding to the current flexible power; when the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update mode of the reference voltage is the high-precision update mode, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the preset step voltage of the first symbol, and the first symbol is determined based on the comparison result between the power at the current moment and the current flexible power; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update mode of the reference voltage is the fast update mode, the current value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power; when the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update mode of the reference voltage is the high-precision update mode, the current value of the reference voltage is determined to be the fusion result between the historical value of the reference voltage and the preset step voltage of the second symbol, and the second symbol is determined based on the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment.

[0200] Optionally, the device further includes:

[0201] The light value acquisition module is used to obtain the light value of the photovoltaic module at the current moment;

[0202] A product calculation module is used to calculate the product between the illumination value of the photovoltaic module at the current moment and the short-circuit current of the photovoltaic module;

[0203] a flexible voltage determination module, configured to calculate a ratio between the current flexible power and the product, and determine the ratio as an alternative current flexible voltage;

[0204] The current flexible voltage determination module is configured to select a voltage between the current inflection point voltage and the current maximum voltage from among the candidate current flexible voltages, and determine the voltage as the current flexible voltage corresponding to the current flexible power.

[0205] Optionally, the maximum power determination module 403 is specifically configured to:

[0206] Obtaining the short-circuit current of the photovoltaic module; the photovoltaic assembly includes at least one photovoltaic module; calculating the ratio between the photovoltaic current and the short-circuit current at a current moment to obtain the illumination value of the photovoltaic assembly at the current moment; detecting the current maximum power point of each photovoltaic module included in the photovoltaic assembly based on the illumination value of the photovoltaic assembly at the current moment; and determining the current global maximum power of the photovoltaic assembly based on the current maximum power point of each photovoltaic module included in the photovoltaic assembly.

[0207] Optionally, the light detection module 402 is specifically configured to:

[0208] Calculate the current photovoltaic power based on the current photovoltaic voltage and photovoltaic current; obtain the photovoltaic power at historical moments; compare the current photovoltaic power with the photovoltaic power at historical moments to detect whether the light has changed.

[0209] The photovoltaic module flexible power point tracking device provided by the embodiment of the present invention can execute the photovoltaic module flexible power point tracking method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing each photovoltaic module flexible power point tracking method.

[0210] Example 5

[0211] Figure 5 This is a schematic diagram of the structure of a photovoltaic system provided by the fifth embodiment of the present invention. Figure 5 As shown, the system includes: a photovoltaic assembly, a voltage probe, a current probe, a power supply, a boost converter, and a photovoltaic assembly flexible power point tracking system for implementing the photovoltaic assembly flexible power point tracking method of any embodiment of the present invention; the photovoltaic assembly includes at least one photovoltaic module;

[0212] Among them, photovoltaic modules are connected together in series to form a photovoltaic assembly.

[0213] Photovoltaic modules are used to process input light and output current;

[0214] The voltage probe is connected to the photovoltaic module and is used to detect the photovoltaic voltage output by the photovoltaic module;

[0215] The current probe is connected to the photovoltaic module and is used to detect the photovoltaic current output by the photovoltaic module;

[0216] The boost converter is connected to the photovoltaic module and is used to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic module;

[0217] The power supply is connected to the boost converter and is used to provide power to the boost converter;

[0218] The photovoltaic module flexible power point tracking system is connected to the voltage probe to obtain the photovoltaic voltage output by the photovoltaic module;

[0219] The photovoltaic module flexible power point tracking system is connected to the current probe to obtain the photovoltaic current output by the photovoltaic module;

[0220] The photovoltaic module flexible power point tracking system is connected to the boost converter and is used to output a switching signal to the boost converter to control the boost converter to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic module;

[0221] The photovoltaic module flexible power point tracking system is used to receive a power tracking mode instruction and current flexible power, process and output a switching signal.

[0222] Among them, the photovoltaic voltage output by the photovoltaic module is recorded as Figure 5 V in pv The photovoltaic current output by the photovoltaic module is recorded as Figure 5 I in pv The boost converter may include Figure 5 The power switch Q boost , power diode D boost and energy storage inductor L boost .

[0223] In addition, the photovoltaic system also includes Figure 5 The capacitor C pv , capacitor C dc And the load power supply voltage V dc ; Among them, the capacitor C pv and capacitor C dc Used to stabilize the voltage of the photovoltaic system. The signal Flag in the figure is used to control the power tracking mode corresponding to the power tracking mode instruction, Pfpp Indicates the current flexible power of the PV panel.

[0224] The photovoltaic module flexible power point tracking system may be an electronic device for implementing the photovoltaic module flexible power point tracking method provided in an embodiment of the present invention.

[0225] The photovoltaic system provided by the embodiment of the present invention can implement the flexible power point tracking method of the photovoltaic module of any embodiment of the present invention, meet the power requirements of the photovoltaic module under different operating conditions, improve flexibility, and improve the stability of the output power of the photovoltaic module under different operating conditions, thereby improving the stability of the power grid.

[0226] Example 6

[0227] Figure 6 A schematic diagram of the structure of an electronic device 600 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0228] like Figure 6 As shown, the electronic device 600 includes at least one processor 601, and a memory connected to the at least one processor 601 in communication, such as a read-only memory (ROM) 602, a random access memory (RAM) 603, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 601 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 602 or the computer program loaded from the storage unit 608 into the random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device 600 can also be stored. The processor 601, ROM 602 and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0229] Multiple components in the electronic device 600 are connected to the I / O interface 605, including an input unit 606, such as a keyboard, a mouse, etc.; an output unit 607, such as various types of displays, speakers, etc.; a storage unit 608, such as a magnetic disk, an optical disk, etc.; and a communication unit 609, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 609 allows the electronic device 600 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0230] Processor 601 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processor, controller, microcontroller, etc. Processor 601 executes the various methods and processes described above, such as the photovoltaic module flexible power point tracking method.

[0231] In some embodiments, the photovoltaic assembly flexible power point tracking method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 608. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 600 via ROM 602 and / or communication unit 609. When the computer program is loaded into RAM 603 and executed by processor 601, one or more steps of the photovoltaic assembly flexible power point tracking method described above can be performed. Alternatively, in other embodiments, processor 601 can be configured to execute the photovoltaic assembly flexible power point tracking method in any other suitable manner (e.g., via firmware).

[0232] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0233] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0234] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0235] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0236] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0237] A computing system may include clients and servers. The clients and servers are generally remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within a cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS (Virtual Private Server) services.

[0238] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0239] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A photovoltaic module flexible power point tracking method, characterized in that: The method comprises: Collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment, and receive power tracking mode instructions; When it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode, detecting whether the light intensity changes according to the photovoltaic voltage and photovoltaic current at the current moment; When the illumination does not change, the current flexible power is obtained, and the current global maximum power is determined according to the photovoltaic voltage and the photovoltaic current; Get the historical flexible power of historical moments; Calculating a difference between the current flexible power and the historical flexible power to determine the difference as a flexible power change value; comparing the current flexible power with the current global maximum power; Determining a target value and an updating method of the reference voltage according to the comparison result and the flexible power change value; determining a current value of the reference voltage according to a target value and an update method of the reference voltage; A switching signal is generated and output according to a current value of the reference voltage, wherein the switching signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic assembly.

2. The method according to claim 1, characterized in that Determining a target value of the reference voltage according to the comparison result and the flexible power variation value includes: When the current flexible power is less than or equal to the current global maximum power, determining the target value of the reference voltage to be the current flexible voltage corresponding to the current flexible power; When the current flexible power is greater than the current global maximum power, the target value of the reference voltage is determined to be the current global maximum voltage corresponding to the current global maximum power.

3. The method according to claim 1, characterized in that The method of determining the updating mode of the reference voltage according to the comparison result and the flexible power change value includes: When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is greater than a preset change threshold, determining that the update mode of the reference voltage is a fast update mode; When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, if the flexible power change value is less than or equal to the preset change threshold, determining that the update mode of the reference voltage is a high-precision update mode; When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is greater than a preset difference threshold, determining that the update mode of the reference voltage is a fast update mode; When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, if the difference between the photovoltaic voltage at the current moment and the current global maximum voltage corresponding to the current global maximum power is less than or equal to the preset difference threshold, it is determined that the update mode of the reference voltage is the high-precision update mode.

4. The method according to claim 3, characterized in that The determining the current value of the reference voltage according to the target value and the update mode of the reference voltage includes: When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power and the update mode of the reference voltage is a fast update mode, determining the current value of the reference voltage to be the current flexible voltage corresponding to the current flexible power; When the target value of the reference voltage is the current flexible voltage corresponding to the current flexible power, and the reference voltage is updated in a high-precision update mode, determining the current value of the reference voltage as a fusion result between a historical value of the reference voltage and a preset step voltage of a first symbol, where the first symbol is determined based on a comparison result between the power at the current moment and the current flexible power; When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power and the update mode of the reference voltage is a fast update mode, determining the current value of the reference voltage to be the current global maximum voltage corresponding to the current global maximum power; When the target value of the reference voltage is the current global maximum voltage corresponding to the current global maximum power, and the update method of the reference voltage is a high-precision update method, the current value of the reference voltage is determined as a fusion result between the historical value of the reference voltage and the preset step voltage of the second symbol, and the second symbol is determined based on the difference between the power at the current moment and the power at the historical moment, and the difference between the photovoltaic voltage at the current moment and the photovoltaic voltage at the historical moment.

5. The method according to claim 4, characterized in that Also includes: Obtaining the illumination value of the photovoltaic module at the current moment; Calculating the product of the illumination value of the photovoltaic assembly at the current moment and the short-circuit current of the photovoltaic module; calculating a ratio between the current flexible power and the product, and determining the ratio as an alternative current flexible voltage; A voltage between the current inflection point voltage and the current maximum voltage is screened out from the candidate current flexible voltages, and is determined as the current flexible voltage corresponding to the current flexible power.

6. The method according to claim 1, characterized in that The determining of the current global maximum power according to the photovoltaic voltage and the photovoltaic current includes: Obtaining the short-circuit current of a photovoltaic module; the photovoltaic assembly includes at least one photovoltaic module; Calculating the ratio of the photovoltaic current at the current moment to the short-circuit current to obtain the illumination value of the photovoltaic assembly at the current moment; Detecting the current maximum power point of each photovoltaic module included in the photovoltaic assembly according to the illumination value of the photovoltaic assembly at the current moment; The current global maximum power of the photovoltaic assembly is determined according to the current maximum power point of each photovoltaic module included in the photovoltaic assembly.

7. The method according to claim 1, characterized in that The detecting whether the illumination changes according to the photovoltaic voltage and photovoltaic current at the current moment includes: Calculating the photovoltaic power at the current moment according to the photovoltaic voltage and photovoltaic current at the current moment; Get the photovoltaic power at the historical moment; The photovoltaic power at the current moment is compared with the photovoltaic power at the historical moment to detect whether the illumination changes.

8. A flexible power point tracking device for photovoltaic modules, characterized in that: include: The voltage and current acquisition module is used to collect the photovoltaic voltage and photovoltaic current output by the photovoltaic module at the current moment and receive power tracking mode instructions; an illumination detection module, configured to detect whether illumination changes based on the photovoltaic voltage and photovoltaic current at the current moment when it is determined that the power tracking mode corresponding to the power tracking mode instruction is the flexible power point tracking mode; a maximum power determination module, configured to obtain the current flexible power when the illumination does not change, and determine the current global maximum power based on the photovoltaic voltage and the photovoltaic current; a current value determination module, configured to obtain a historical flexible power at a historical moment; calculate a difference between the current flexible power and the historical flexible power, and determine the difference as a flexible power change value; Comparing the current flexible power with the current global maximum power; determining a target value and an updating method of a reference voltage based on the comparison result and the flexible power change value; and determining a current value of the reference voltage based on the target value and the updating method of the reference voltage; The switch signal output module is used to generate and output a switch signal according to the current value of the reference voltage, wherein the switch signal is used to adjust the photovoltaic voltage and photovoltaic current of the photovoltaic assembly.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the photovoltaic assembly flexible power point tracking method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the photovoltaic assembly flexible power point tracking method according to any one of claims 1 to 7 when executed.

11. A photovoltaic system, characterized in that: The system comprises: a photovoltaic assembly, a voltage probe, a current probe, a power supply, a boost converter, and a photovoltaic assembly flexible power point tracking system for implementing the photovoltaic assembly flexible power point tracking method according to any one of claims 1 to 7; the photovoltaic assembly comprises at least one photovoltaic module; The photovoltaic module is used to process input light and output current; The voltage probe is connected to the photovoltaic module and is used to detect the photovoltaic voltage output by the photovoltaic module; The current probe is connected to the photovoltaic assembly and is used to detect the photovoltaic current output by the photovoltaic assembly; The boost converter is connected to the photovoltaic assembly and is used to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic assembly; The power supply is connected to the boost converter and is used to provide power to the boost converter; The photovoltaic module flexible power point tracking system is connected to the voltage probe and is used to obtain the photovoltaic voltage output by the photovoltaic module; The photovoltaic module flexible power point tracking system is connected to the current probe and is used to obtain the photovoltaic current output by the photovoltaic module; The photovoltaic assembly flexible power point tracking system is connected to the boost converter and is used to output a switching signal to the boost converter to control the boost converter to adjust the photovoltaic voltage and photovoltaic current output by the photovoltaic assembly; The photovoltaic module flexible power point tracking system is used to receive a power tracking mode instruction and current flexible power, process and obtain and output a switching signal.

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