Photovoltaic panel boost conversion circuit and boost control method of double boost conversion circuits

Abstract

The invention discloses a boost control method for a photovoltaic panel boost conversion circuit and a dual boost conversion circuit, and relates to the field of photovoltaic panel output voltage control, and the method comprises the steps: setting a preset input voltage range, a preset input current range, the energy storage capacity of an inductor, and the capacitance value of a capacitor based on a preset voltage value corresponding to a voltage bus; the transistor is controlled to be in a conducting state, so that the inductor stores electric energy output by the PV photovoltaic panel; the duty ratio of a transistor is modulated through the real-time output voltage and the real-time output current, the output voltage of the PV photovoltaic panel is controlled to be within a preset input voltage range, the output current is controlled to be within a preset input current range, the second path is conducted, the charged inductor outputs electric energy to a load connected with the output end of the voltage bus, and the load is charged. Therefore, the sum of the output voltages of the photovoltaic panel, the inductor and the capacitor reaches a preset voltage value corresponding to the voltage bus; according to the invention, the output voltage of the PV is improved to a voltage level enough for a voltage bus in a DC-DC input stage.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic panel output voltage control, and particularly to a boost control method for a boost conversion circuit and a dual boost conversion circuit of a photovoltaic panel. Background Art

[0002] In recent years, clean energy in China has been developed and utilized on a large scale. New energy represented by photovoltaic has gradually increased its proportion in the energy structure. As the core device for new energy photovoltaic power generation to be connected to the grid, the control performance of the grid-connected inverter directly affects the efficiency of the power generation system. The inverter can inject power into the grid and can receive energy from two sources: photovoltaic and battery. The DC-DC input stage of the inverter is responsible for processing the power provided by the photovoltaic panel (PV), and after processing, it outputs through the voltage bus (or intermediate bus). Due to the characteristics of PV, the PV output voltage varies with current and also with the environment (solar irradiance, temperature). Therefore, it is particularly important to raise the output voltage of PV to a voltage level sufficient for the voltage bus in the DC-DC input stage to enable the grid-connected inverter to output high-quality electric energy. Summary of the Invention

[0003] In order to raise the output voltage of PV to a voltage level sufficient for the voltage bus in the DC-DC input stage, the present invention proposes a boost control method for a boost conversion circuit of a photovoltaic panel. The final output voltage of the photovoltaic panel is raised to a preset voltage value corresponding to the voltage bus through the boost conversion circuit of the photovoltaic panel. The boost conversion circuit of the photovoltaic panel includes: a boost converter, a voltage bus, an output voltage monitoring circuit, and an output current monitoring circuit; the boost converter includes: an inductor, a transistor, a diode, and a capacitor that are sequentially electrically connected between the positive power supply of the PV photovoltaic panel and the output terminal of the voltage bus; the boost control method includes:

[0004] Measuring the real-time output voltage and real-time output current of the PV photovoltaic panel through the output voltage monitoring circuit and the output current monitoring circuit; setting a preset input voltage range corresponding to the output voltage of the PV photovoltaic panel, a preset input current range corresponding to the output current of the PV photovoltaic panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus, so that the sum of the output voltage of the inductor, the output voltage of the PV photovoltaic panel, and the voltage value output by the capacitor reaches the preset voltage value corresponding to the voltage bus;

[0005] Controlling the transistor to be in a conducting state, conducting the first path formed by the positive power supply of the PV photovoltaic panel, the inductor, and the transistor, so that the inductor stores the electric energy output by the PV photovoltaic panel;

[0006] By modulating the duty cycle of the transistor with the real-time output voltage and real-time output current, the output voltage of the PV panel is controlled to be within the preset input voltage range and the output current is within the preset input current range. The second path formed by the positive power supply of the PV panel, the inductor, the transistor, the diode, and the capacitor is turned on, and the charged inductor outputs electrical energy to the load connected to the output terminal of the voltage bus, so that the sum of the output voltages of the PV panel, the inductor, and the capacitor reaches the preset voltage value corresponding to the voltage bus; the final output voltage of the PV panel is equal to the sum of the output voltage of the PV panel after modulation, the output voltage of the inductor, and the output voltage of the capacitor.

[0007] Further, in the boost converter: one end of the inductor is connected to the positive power supply of the PV panel, and the other end is connected to the drain of the transistor and then connected to the positive electrode of the diode. The negative electrode of the diode is connected to one end of the capacitor and then connected to the output terminal of the voltage bus; the other end of the capacitor is grounded; the source of the transistor is grounded, and the gate is connected to the PWM controller; the negative terminal of the PV panel is grounded; the PWM controller is used to modulate the duty cycle of the transistor.

[0008] The present invention also proposes a boost control method for a double-boost conversion circuit of a PV panel. The final output voltage of the PV panel is increased to the preset voltage value corresponding to the voltage bus through the double-boost conversion circuit of the PV panel. The double-boost conversion circuit of the PV panel includes:

[0009] A first boost converter, a second boost converter, a voltage bus, and an output voltage monitoring circuit and an output current monitoring circuit corresponding to each boost converter. The first boost converter and the second boost converter both include an inductor, a transistor, a diode, and an energy storage capacitor connected in sequence; the first boost converter and the second boost converter share an energy storage capacitor; one end of the first boost converter is connected to the positive electrode of the first PV panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus; one end of the second boost converter is connected to the positive electrode of the second PV panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus; the negative electrodes of the first PV panel and the second PV panel are commonly grounded; the boost control method corresponding to any boost converter includes:

[0010] Measuring the real-time output voltage and real-time output current of the PV panel through the output voltage monitoring circuit and the output current monitoring circuit; setting the preset input voltage range corresponding to the output voltage of the PV panel, the preset input current range corresponding to the output current of the PV panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus, so that the sum of the output voltage of the inductor, the output voltage of the PV panel, and the voltage value output by the capacitor reaches the preset voltage value corresponding to the voltage bus;

[0011] The control transistor is in the on state, conducting the first path formed by the positive power supply of the PV panel, the inductor, and the transistor, enabling the inductor to store the electrical energy output by the PV panel;

[0012] By modulating the duty cycle of the transistor through the real-time output voltage and real-time output current, the output voltage of the PV panel is controlled to be within a preset input voltage range and the output current is within a preset input current range. The second path formed by the positive power supply of the PV panel, the inductor, the transistor, the diode, and the capacitor is conducted, enabling the charged inductor to output electrical energy to the load connected to the output terminal of the voltage bus, so that the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor reaches the preset voltage value corresponding to the voltage bus; the final output voltage of the photovoltaic panel is equal to the sum of the output voltage of the photovoltaic panel after modulation, the output voltage of the inductor, and the output voltage of the capacitor.

[0013] Further, the first boost converter specifically includes:

[0014] A first inductor, a first transistor, a first diode, and a shared energy storage capacitor; where:

[0015] One end of the first inductor is connected to the positive power supply of the first PV panel, and the other end is connected to the drain of the first transistor and then connected to the positive terminal of the first diode. The negative terminal of the first diode is connected to one end of the energy storage capacitor and then connected to the output terminal of the voltage bus; the other end of the energy storage capacitor is grounded; the source of the first transistor is grounded, and the gate is connected to the first PWM controller; the negative terminal of the first PV panel is grounded; the first PWM controller is used to modulate the duty cycle of the first transistor.

[0016] Further, the second boost converter specifically includes:

[0017] A second inductor, a second transistor, a second diode, and a shared energy storage capacitor; where:

[0018] One end of the second inductor is connected to the positive power supply of the second PV panel, and the other end is connected to the drain of the second transistor and then connected to the positive terminal of the second diode. The negative terminal of the second diode is connected to the connection line between the negative terminal of the first diode and the energy storage capacitor; the source of the second transistor is grounded, and the gate is connected to the second PWM controller; the negative terminal of the second PV panel is grounded; the second PWM controller is used to modulate the duty cycle of the second transistor.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] (1) The present invention sets a preset input voltage range corresponding to the output voltage of the PV photovoltaic panel, a preset input current range corresponding to the output current of the PV photovoltaic panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus; controls the transistor to be in the conducting state, thereby conducting the first path formed by the positive power supply of the PV photovoltaic panel, the inductor, and the transistor, so that the inductor stores the electrical energy output by the PV photovoltaic panel; modulates the duty cycle of the transistor through the real-time output voltage and real-time output current, controls the output voltage of the PV photovoltaic panel to be within the preset input voltage range and the output current to be within the preset input current range, and conducts the second path formed by the positive power supply of the PV photovoltaic panel, the inductor, the transistor, the diode, and the capacitor, so that the charged inductor outputs electrical energy to the load connected to the output end of the voltage bus, thereby making the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor reach the preset voltage value corresponding to the voltage bus; that is, the present invention realizes raising the output voltage of the PV to a voltage level sufficient for the voltage bus during the DC-DC input stage, ensuring the high quality and stability of the electrical energy output by the grid-connected inverter.

[0021] (2) The present invention is provided with an independently controllable first boost converter and a second boost converter in the photovoltaic panel dual-boost conversion circuit, and both are connected to the voltage bus. This configuration has multiple advantages: Since each boost converter only processes half of the total output power, the power components can be designed with lower specifications, reducing the boost cost and power loss. Additionally, since the duty cycle of each boost converter can be modulated separately, the control flexibility is improved. At the same time, by controlling the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor corresponding to each boost converter to reach the preset voltage value corresponding to the voltage bus, the efficiency of extracting energy from the PV photovoltaic panel is improved. Description of the Drawings

[0022] Figure 1 It is a flowchart of a boost control method for a photovoltaic panel boost conversion circuit;

[0023] Figure 2 It is a circuit diagram of a photovoltaic panel boost conversion circuit;

[0024] Figure 3 It is a circuit diagram of a photovoltaic panel dual-boost conversion circuit;

[0025] Figure 4 It is a circuit diagram for monitoring the output voltage;

[0026] Figure 5 It is a circuit diagram for monitoring the output current. Detailed Embodiments

[0027] The following are specific embodiments of the present invention in combination with the drawings, and the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0028] Embodiment 1

[0029] In order to raise the output voltage of the PV to a voltage level sufficient for the voltage bus during the DC - DC input stage and ensure the high quality and stability of the electrical energy output by the grid - connected inverter, as Figure 1 shown, the present invention proposes a boost control method for a PV panel boost conversion circuit, which raises the final output voltage of the PV panel to a preset voltage value corresponding to the voltage bus through the PV panel boost conversion circuit. The PV panel boost conversion circuit includes: a boost converter, a voltage bus, an output voltage monitoring circuit, and an output current monitoring circuit; as Figure 2 shown, the boost converter includes: an inductor L1, a transistor Q1, a diode D1, and a capacitor C1 that are sequentially electrically connected between the positive power supply PV1+ of the PV panel and the output end of the voltage bus Vbus;

[0030] In the boost converter: one end of the inductor L1 is connected to the positive power supply of the PV panel PV1, and the other end is connected to the drain of the transistor Q1 and then connected to the positive pole of the diode D1. The negative pole of the diode D1 is connected to one end of the capacitor C1 and then connected to the output end of the voltage bus; the other end of the capacitor C1 is grounded; the source of the transistor Q1 is grounded, and the gate is connected to the PWM controller d1; the negative pole of the PV panel PV1 is grounded; the PWM controller is used to modulate the duty cycle of the transistor Q1.

[0031] In this embodiment, the circuit diagram corresponding to the output voltage monitoring circuit is as Figure 4 shown, where Vpv is connected to the output of the PV panel PV1, and Vpv_sens represents the output of the signal.

[0032] The circuit diagram corresponding to the output current monitoring circuit is as Figure 5 shown, where Vpv_sensor is connected to the output of the PV panel PV1, and Vpv_out represents the output of the signal.

[0033] The boost control method includes:

[0034] Measuring the real - time output voltage and real - time output current of the PV panel PV1 through the output voltage monitoring circuit and the output current monitoring circuit; setting a preset input voltage range corresponding to the output voltage of the PV panel, a preset input current range corresponding to the output current of the PV panel, the energy storage capacity of the inductor L1, and the capacitance value of the capacitor C1 based on the preset voltage value corresponding to the voltage bus Vbus, so that the sum of the output voltage of the inductor L1, the output voltage of the PV panel PV1, and the voltage value output by the capacitor C1 reaches the preset voltage value corresponding to the voltage bus Vbus;

[0035] The control transistor Q1 is turned on to conduct the first path formed by the positive power supply of the PV photovoltaic panel, the inductor L1, and the transistor Q1, so that the inductor L1 stores the electric energy output by the PV photovoltaic panel PV1;

[0036] It should be noted that Figure 2 In, L1, Q1, D1, and C1 form a boost converter. When Q1 is ON, the current flow path, i.e., the first path, is PV1 - L1 - Q1, charging the inductor L1. At this stage, the input is almost disconnected from the voltage bus because the diode D1 is reverse-biased, blocking the current path, and C1 provides energy to the load connected to the output terminal of the voltage bus when Q1 is ON.

[0037] By modulating the duty cycle of the transistor Q1 through the real-time output voltage and real-time output current, the output voltage of the PV photovoltaic panel PV1 is controlled to be within the preset input voltage range, and the output current is within the preset input current range. The second path formed by the positive power supply of the PV photovoltaic panel, the inductor L1, the transistor Q1, the diode D1, and the capacitor C1 is conducted, so that the charged inductor L1 outputs electric energy to the load connected to the output terminal of the voltage bus, thereby making the sum of the output voltages of the photovoltaic panel PV1, the inductor L1, and the capacitor C1 reach the preset voltage value corresponding to the voltage bus Vbus; the final output voltage of the photovoltaic panel PV1 is equal to the sum of the output voltage of the photovoltaic panel PV1 after modulation, the output voltage of the inductor L1, and the output voltage of the capacitor C1.

[0038] The present invention sets the preset input voltage range corresponding to the output voltage of the PV photovoltaic panel, the preset input current range corresponding to the output current of the PV photovoltaic panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus; controls the transistor to be in the on state, thereby conducting the first path formed by the positive power supply of the PV photovoltaic panel, the inductor, and the transistor, so that the inductor stores the electric energy output by the PV photovoltaic panel; modulates the duty cycle of the transistor through the real-time output voltage and real-time output current, controls the output voltage of the PV photovoltaic panel to be within the preset input voltage range and the output current to be within the preset input current range, conducts the second path formed by the positive power supply of the PV photovoltaic panel, the inductor, the transistor, the diode, and the capacitor, so that the charged inductor outputs electric energy to the load connected to the output terminal of the voltage bus, thereby making the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor reach the preset voltage value corresponding to the voltage bus; that is, the present invention realizes raising the output voltage of the PV to a voltage level sufficient for the voltage bus in the DC - DC input stage, ensuring the high quality and stability of the electric energy output by the grid-connected inverter.

[0039] Embodiment 2

[0040] The present invention also provides a boost control method for a photovoltaic panel dual-boost conversion circuit, which boosts the final output voltage of the photovoltaic panel to a preset voltage value corresponding to the voltage bus, such as Figure 3 shown, the photovoltaic panel dual-boost conversion circuit includes:

[0041] a first boost converter, a second boost converter, a voltage bus, and an output voltage monitoring circuit corresponding to each boost converter (as Figure 4 shown) and an output current monitoring circuit (as Figure 5 shown), both the first boost converter and the second boost converter include an inductor, a transistor, a diode, and an energy storage capacitor connected in sequence; the first boost converter and the second boost converter share an energy storage capacitor; one end of the first boost converter is connected to the positive electrode of the first PV photovoltaic panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus; one end of the second boost converter is connected to the positive electrode of the second PV photovoltaic panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus; the negative electrodes of the first PV photovoltaic panel and the second PV photovoltaic panel are grounded together;

[0042] The first boost converter specifically includes:

[0043] a first inductor L1, a first transistor Q1, a first diode D1, and a shared energy storage capacitor C1; where:

[0044] One end of the first inductor L1 is connected to the positive power supply of the first PV photovoltaic panel PV1, and the other end is connected to the drain of the first transistor Q1 and then connected to the positive terminal of the first diode D1. The negative terminal of the first diode D1 is connected to one end of the energy storage capacitor C1 and then connected to the output terminal of the voltage bus; the other end of the energy storage capacitor C1 is grounded; the source of the first transistor Q1 is grounded, and the gate is connected to the first PWM controller d1; the negative terminal of the first PV photovoltaic panel PV1 is grounded; the first PWM controller d1 is used to modulate the duty cycle of the first transistor Q1.

[0045] The second boost converter specifically includes:

[0046] a second inductor L2, a second transistor Q2, a second diode D2, and a shared energy storage capacitor C1; where:

[0047] One end of the second inductor L2 is connected to the positive power supply of the second PV photovoltaic panel PV2, and the other end is connected to the drain of the second transistor Q2 and then connected to the positive terminal of the second diode D2. The negative terminal of the second diode D2 is connected to the connection line between the negative terminal of the first diode D1 and the energy storage capacitor C1; the source of the second transistor Q2 is grounded, and the gate is connected to the second PWM controller d2; the negative terminal of the second PV photovoltaic panel PV2 is grounded; the second PWM controller d2 is used to modulate the duty cycle of the second transistor Q2.

[0048] The boost control method corresponding to any boost converter includes:

[0049] Measure the real-time output voltage and real-time output current of the PV photovoltaic panel through the output voltage monitoring circuit and the output current monitoring circuit; based on the preset voltage value corresponding to the voltage bus, set the preset input voltage range corresponding to the PV photovoltaic panel output voltage, the preset input current range corresponding to the PV photovoltaic panel output current, the energy storage capacity of the inductor, and the capacitance value of the capacitor, so that the sum of the output voltage of the inductor, the output voltage of the PV photovoltaic panel, and the voltage value output by the capacitor reaches the preset voltage value corresponding to the voltage bus;

[0050] Control the transistor to be in the conducting state, conduct the first path formed by the positive power supply of the PV photovoltaic panel, the inductor, and the transistor, so that the inductor stores the electric energy output by the PV photovoltaic panel;

[0051] Modulate the duty cycle of the transistor through the real-time output voltage and real-time output current, control the output voltage of the PV photovoltaic panel to be within the preset input voltage range and the output current to be within the preset input current range, conduct the second path formed by the positive power supply of the PV photovoltaic panel, the inductor, the transistor, the diode, and the capacitor, so that the charged inductor outputs electric energy to the load connected to the output end of the voltage bus, thereby making the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor reach the preset voltage value corresponding to the voltage bus; the final output voltage of the photovoltaic panel is equal to the sum of the output voltage of the photovoltaic panel after modulation, the output voltage of the inductor, and the output voltage of the capacitor.

[0052] It should be noted that the boost converter in this embodiment can be independently controlled, and each boost converter is connected to the intermediate voltage bus, which means that their outputs are connected together. This configuration has multiple advantages: since each boost converter only processes half of the total output power, the power components can be designed with lower specifications, reducing the boost cost and power loss. In addition, since the duty cycle of each boost converter can be individually modulated, the control flexibility is improved. At the same time, controlling the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor corresponding to each boost converter to reach the preset voltage value corresponding to the voltage bus improves the efficiency and stability when extracting energy from the PV photovoltaic panel.

[0053] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0054] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A boost control method for a boost conversion circuit of a photovoltaic panel, characterized in that, The final output voltage of the PV panel is increased to the preset voltage value corresponding to the voltage bus through a PV panel boost conversion circuit. The PV panel boost conversion circuit includes: a boost converter, a voltage bus, an output voltage monitoring circuit, and an output current monitoring circuit. The boost converter includes: an inductor, a transistor, a diode, and a capacitor that are sequentially electrically connected between the positive power supply of the PV panel and the output terminal of the voltage bus. The boost control method includes: Measuring the real-time output voltage and real-time output current of the PV panel through the output voltage monitoring circuit and the output current monitoring circuit; setting a preset input voltage range corresponding to the output voltage of the PV panel, a preset input current range corresponding to the output current of the PV panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus, so that the sum of the output voltage of the inductor, the output voltage of the PV panel, and the voltage value output by the capacitor reaches the preset voltage value corresponding to the voltage bus; Controlling the transistor to be in the conducting state, turning on the first path formed by the positive power supply of the PV panel, the inductor, and the transistor, so that the inductor stores the electrical energy output by the PV panel; Modulating the duty cycle of the transistor through the real-time output voltage and real-time output current, controlling the output voltage of the PV panel to be within the preset input voltage range and the output current to be within the preset input current range, turning on the second path formed by the positive power supply of the PV panel, the inductor, the transistor, the diode, and the capacitor, so that the charged inductor outputs electrical energy to the load connected to the output terminal of the voltage bus, thereby making the sum of the output voltages of the PV panel, the inductor, and the capacitor reach the preset voltage value corresponding to the voltage bus; the final output voltage of the PV panel is equal to the sum of the output voltage of the PV panel after modulation, the output voltage of the inductor, and the output voltage of the capacitor.

2. The boost control method for a boost conversion circuit of a photovoltaic panel according to claim 1, wherein, In the boost converter: one end of the inductor is connected to the positive power supply of the PV panel, and the other end is connected to the drain of the transistor and then connected to the positive pole of the diode. The negative pole of the diode is connected to one end of the capacitor and then connected to the output terminal of the voltage bus; the other end of the capacitor is grounded; the source of the transistor is grounded, and the gate is connected to the PWM controller; The negative terminal of the PV panel is grounded; the PWM controller is used to modulate the duty cycle of the transistor.

3. A boost control method for a double-boost conversion circuit of a photovoltaic panel, characterized in that, The final output voltage of the PV panel is increased to the preset voltage value corresponding to the voltage bus through a PV panel double boost conversion circuit. The PV panel double boost conversion circuit includes: A first boost converter, a second boost converter, a voltage bus, and an output voltage monitoring circuit and an output current monitoring circuit corresponding to each boost converter. The first boost converter and the second boost converter each include an inductor, a transistor, a diode, and an energy storage capacitor that are electrically connected in sequence. The first boost converter and the second boost converter share an energy storage capacitor. One end of the first boost converter is connected to the positive electrode of the first PV photovoltaic panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus. One end of the second boost converter is connected to the positive electrode of the second PV photovoltaic panel, and the other end is connected to the energy storage capacitor and then connected to the voltage bus. The negative electrodes of the first PV photovoltaic panel and the second PV photovoltaic panel are commonly grounded. The boost control method corresponding to any boost converter includes: Measuring the real-time output voltage and real-time output current of the PV photovoltaic panel through the output voltage monitoring circuit and the output current monitoring circuit; setting a preset input voltage range corresponding to the output voltage of the PV photovoltaic panel, a preset input current range corresponding to the output current of the PV photovoltaic panel, the energy storage capacity of the inductor, and the capacitance value of the capacitor based on the preset voltage value corresponding to the voltage bus, so that the sum of the output voltage of the inductor, the output voltage of the PV photovoltaic panel, and the voltage value output by the capacitor reaches the preset voltage value corresponding to the voltage bus; Controlling the transistor to be in the conducting state, conducting the first path formed by the positive electrode power supply of the PV photovoltaic panel, the inductor, and the transistor, so that the inductor stores the electric energy output by the PV photovoltaic panel; Modulating the duty cycle of the transistor through the real-time output voltage and real-time output current, controlling the output voltage of the PV photovoltaic panel to be within the preset input voltage range and the output current to be within the preset input current range, conducting the second path formed by the positive electrode power supply of the PV photovoltaic panel, the inductor, the transistor, the diode, and the capacitor, so that the charged inductor outputs electric energy to the load connected to the output end of the voltage bus, thereby making the sum of the output voltages of the photovoltaic panel, the inductor, and the capacitor reach the preset voltage value corresponding to the voltage bus; the final output voltage of the photovoltaic panel is equal to the sum of the output voltage of the photovoltaic panel after modulation, the output voltage of the inductor, and the output voltage of the capacitor.

4. A boost control method for a double-boost conversion circuit of a photovoltaic panel according to claim 3, characterized in that, The first boost converter specifically includes: A first inductor, a first transistor, a first diode, and a shared energy storage capacitor; where: One end of the first inductor is connected to the positive electrode power supply of the first PV photovoltaic panel, and the other end is connected to the drain of the first transistor and then connected to the positive extreme of the first diode. The negative extreme of the first diode is connected to one end of the energy storage capacitor and then connected to the output end of the voltage bus. The other end of the energy storage capacitor is grounded. The source of the first transistor is grounded, and the gate is connected to the first PWM controller. The negative extreme of the first PV photovoltaic panel is grounded. The first PWM controller is used to modulate the duty cycle of the first transistor.

5. The boost control method for a double-boost conversion circuit of a photovoltaic panel according to claim 3, characterized in that The second boost converter specifically includes: A second inductor, a second transistor, a second diode, and a shared energy storage capacitor; where: One end of the second inductor is connected to the positive power supply of the second PV photovoltaic panel, and the other end is connected to the drain of the second transistor and then connected to the positive terminal of the second diode. The negative terminal of the second diode is connected to the connection line between the negative terminal of the first diode and the energy storage capacitor; the source of the second transistor is grounded, and the gate is connected to the second PWM controller; the negative terminal of the second PV photovoltaic panel is grounded; the second PWM controller is used to modulate the duty cycle of the second transistor.

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