Wave energy-photovoltaic self-sustaining power supply system of ocean data buoy and control method thereof

Abstract

The invention relates to the technical field of self-sustaining power supply of ocean data buoys, and discloses a wave energy-photovoltaic self-sustaining power supply system of an ocean data buoy and a control method of the wave energy-photovoltaic self-sustaining power supply system of the ocean data buoy. The solar photovoltaic cell panel is arranged outside the ocean data buoy; the storage battery system is configured to store electric energy generated by the built-in direct-drive type wave power generation device and the solar photovoltaic cell panel and release the electric energy according to control; and the power electronic control system is configured to realize wave energy-photovoltaic MPPT (maximum power point tracking) control and storage battery charging based on a DSP (digital signal processor) controller. Self-sustaining power supply of the ocean data buoy is achieved by integrating multi-machine parallel built-in direct-driven wave power generation and photovoltaic power generation, and the self-sustaining power supply capacity of the ocean data buoy in the deep and far sea is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of self-sustaining power supply for ocean data buoys, and in particular to a wave energy-photovoltaic self-sustaining power supply system for ocean data buoys and a control method thereof. Background Art

[0002] The oceans are rich in resources, including fisheries, oil and gas, and support global economic development. Developing marine fisheries, exploring offshore oil and gas resources, maritime data communications, and hydrographic data collection all require precise data. As key nodes for ocean data collection and signal transmission, the sustained and reliable operation of ocean data buoys is irreplaceable for research in areas such as ocean data collection and disaster prevention and early warning. Currently, the energy harvesting units in self-sustaining power supply systems for ocean data buoys are mostly powered by a single energy source or rely on regularly replaced batteries.

[0003] With the development of energy harvesting technology, more and more wave energy harvesters are being proposed to provide self-sustaining power for ocean data buoys. Among them, the designed and developed built-in direct-drive wave power generation device, installed inside the buoy, absorbs the buoy's pitching motion and converts wave energy into electricity, showing promising application prospects. Simultaneously, photovoltaic panels installed on the buoy's exterior absorb solar energy and convert it into electricity. It is worth noting that, because wave energy generation has low power in good weather and photovoltaic power generation efficiency plummets on rainy days, neither of the above-mentioned self-sustaining power supply methods can provide a single, long-term power supply for the buoy. The low average power and long operating time of wave energy generation complement the high average power and low illumination time of photovoltaic power generation. Therefore, the design and development of a hybrid energy source and control system for these two self-sustaining power supply methods for buoys has strong application prospects. The present invention aims to develop a wave energy-photovoltaic hybrid self-sustaining power supply system to solve the problem of self-sustaining power supply for ocean data buoys.

[0004] Chinese Patent Publication No. CN111271214B discloses a wave energy power generation device comprising: a bracket fixed within a buoy compartment; a core power generation unit that moves linearly relative to the bracket; a magnetic screw stator rod extending through a motor platform and fixed to the bracket at both ends; a magnetic screw rotor barrel located within the core power generation unit and concentrically sleeved around the magnetic screw stator rod; and a permanent magnet synchronous generator connected to the magnetic screw rotor barrel. Chinese Patent Publication No. CN118188280A discloses a built-in rocking buoy wave energy power generation system and control method. The control system of this wave energy power generation device uses a boost converter circuit to adjust the dynamic load impedance of the core power generation unit, improving the operating efficiency of the magnetic screw and enabling motion control of the high-weight core power generation unit. Chinese Patent Publication No. CN119664567A also discloses a maximum power extraction control method for a built-in direct-drive wave energy power generation device. The maximum power extraction control method for a built-in direct-drive wave power generator utilizes the same boost converter circuit as disclosed in Chinese Patent Publication No. CN118188280A. The numerical relationship between the average power and voltage at the PMSG rectifier output is derived through time-domain analysis, and the perturbation-observation method is used to achieve maximum power extraction from the built-in direct-drive wave power generator. However, both the active motion control and MPPT control methods utilize wave energy as a single energy source to power ocean data buoys, making it difficult to meet the requirements for self-sustaining power supply for ocean data buoys. By designing a rational control system and proposing corresponding control methods, the integration of wave energy and photovoltaic energy sources can achieve self-sustaining power supply using a wave-photovoltaic hybrid energy source. This solution can effectively improve the reliability of self-sustaining power supply for ocean data buoys. Summary of the Invention

[0005] The purpose of the present invention is to provide a wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy and a control method thereof, aiming to achieve self-sustaining power supply for the ocean data buoy, thereby improving the endurance of the ocean data buoy in the deep sea.

[0006] To achieve the above objectives and other related objectives, the present invention provides a wave energy-photovoltaic hybrid self-sustaining power supply system for ocean data buoys and a control method thereof. To achieve the above objectives, the present invention is based on the inventor's previously published Chinese patent publication number CN111271214B, a wave energy power generation device for a built-in swaying buoy, and a maximum power extraction control method for a built-in direct-drive wave energy power generation device published in CN119664567A. The system comprises:

[0007] Multi-machine parallel system, including several independently moving built-in direct-drive wave power generation devices;

[0008] Solar photovoltaic panels, installed on the outside of the ocean data buoy;

[0009] a battery system configured to store electrical energy generated by the built-in direct-drive wave power generation device and the solar photovoltaic panels and to release it according to control;

[0010] The power electronic control system is configured to implement MPPT control of wave energy-photovoltaic and battery charging based on a DSP controller.

[0011] Preferably, the built-in direct-drive wave power generation device includes a cabin, a bracket, a transmission mechanism and a core power generation unit, and the core power generation unit includes a magnetic screw rotor, a sprocket mechanism, a permanent magnet synchronous generator and a position sensor;

[0012] Both ends of the bracket are mounted on the side walls of the cabin, the transmission mechanism is arranged between the brackets, the permanent magnet synchronous generator is connected to the transmission mechanism via a magnetic screw rotor and a sprocket mechanism, and the position sensor is arranged at one end of the bracket;

[0013] The three-phase output end of the permanent magnet synchronous generator is connected to the wave energy input end of the boost circuit to realize MPPT control of the built-in direct-drive wave power generation device, and the output end of the boost circuit is connected to the input end of the step-down chopper circuit to realize control of battery charging.

[0014] Preferably, the solar photovoltaic panel is configured to absorb solar radiation to generate electrical energy, the output end of the solar photovoltaic panel is connected to the photovoltaic input end of the power electronic control circuit through a capacitor, and the generated electrical energy is transmitted to the battery to charge the battery.

[0015] Preferably, the power electronic control system is configured to implement MPPT control of the built-in direct-drive wave power generation device and MPPT control of photovoltaic power generation of solar photovoltaic panels based on a DSP controller, and to control the step-down chopper circuit of wave energy power generation.

[0016] The present application also discloses a control method for a wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, which is used to apply the above-mentioned wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, comprising:

[0017] S100, built-in MPPT control for direct-drive wave power generation devices, specifically:

[0018] S110, real-time acquisition of the motion position signal of the core power generation unit of the built-in direct-drive wave power generation device in the multi-machine parallel system, the capacitor voltage signal of the rectifier output end of the permanent magnet synchronous generator, and the inductor current signal of the boost circuit;

[0019] S120, determining the motion reference position X of the core power generation unit ref The position error signal between the real-time position X detected by the position sensor is adjusted using a PI controller to obtain the position reference voltage U pos_ref ;

[0020] S130, collects the capacitor voltage U at the rectifier output end of the permanent magnet synchronous generator in real time through the DSP controller dc and the inductor current I dc , the optimal reference voltage U is obtained by hill climbing method wave_MPPT , and use the PI controller to adjust the MPPT reference voltage U MPPT_ref ;

[0021] S140, determining the position reference voltage U pos_ref and MPPT reference voltage U MPPT_ref The sum value is set as the final capacitor reference voltage U at the output end of the permanent magnet synchronous generator rectifier. dc_ref ;

[0022] S150, using a PI controller to calculate a duty cycle D and generate a PWM signal for the built-in direct-drive wave power generation device to track the capacitor voltage at the rectifier output end of the permanent magnet synchronous generator;

[0023] S200, MPPT control of photovoltaic power generation, specifically:

[0024] S210, real-time acquisition of the output voltage U on the solar photovoltaic panel pv And the output current signal I pv ;

[0025] S220, dynamically adjust the optimal working point U of photovoltaic power generation through the hill climbing method pv_MPPT Make the solar photovoltaic panels always work at the position of maximum power output;

[0026] S230, and using a PI controller to calculate the duty cycle D of the photovoltaic boost circuit, generating a PWM signal for the photovoltaic power generation device to achieve MPPT control of the photovoltaic power generation;

[0027] S300, control of the charging circuit, specifically:

[0028] S310, real-time acquisition of the output terminal capacitor voltage amplitude U of the built-in direct-drive wave power generation device MPPT boost circuit of the multi-machine parallel system wave_MPPT_out ;

[0029] S320, determine the capacitor voltage amplitude U wave_MPPT_out The minimum input voltage threshold U for charging the battery with the step-down chopper circuit buck_in size;

[0030] S330, when U wave_MPPT_out >U buck_in , start the step-down chopper circuit to charge the battery;

[0031] S340, when U wave_MPPT_out <U buck_in , the switch tube of the step-down chopper circuit is turned off, and energy is accumulated for the output capacitor of the MPPT boost circuit of the built-in direct-drive wave power generation device in the multi-machine parallel system.

[0032] Compared to existing technologies, this invention achieves a diversified energy supply by combining wave energy and solar photovoltaic power generation. Under varying weather and ocean conditions, wave energy and solar energy complement each other, effectively improving the stability and reliability of the power supply system. This ensures that the ocean data buoy can continuously and stably obtain electricity, meeting its power needs for long-term operation in the marine environment.

[0033] By adopting MPPT (maximum power point tracking) control technology, both the built-in direct-drive wave power generation device and the solar photovoltaic panel can adjust the working status in real time so that they always operate at the maximum power output point, thereby maximizing the conversion efficiency of wave energy and solar energy and making full use of the wave energy and solar energy resources in the ocean.

[0034] The multi-machine parallel system has several independently moving built-in direct-drive wave power generation devices, which not only ensure that each power generation device can work relatively independently in a complex marine environment, reducing the risk of the entire system being paralyzed due to the failure of a single device, but also increases the capture of wave energy and power generation through parallel connection, thereby improving the overall performance of the system.

[0035] The DSP-based power electronics control system enables precise control and coordinated management of the wave energy-photovoltaic power generation system. By controlling the MPPT function of the built-in direct-drive wave generator and solar photovoltaic panels, as well as the charging circuit, the system ensures efficient and stable operation under different operating conditions, achieving optimized management and distribution of electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0037] Figure 1 Schematic diagram of the wave energy-photovoltaic self-sustaining power supply system of the ocean data buoy of the present invention;

[0038] Figure 2 This is a graph showing the power generation and gravitational work done by three built-in direct-drive wave power generation devices during a 60-second simulation of the wave energy-photovoltaic self-sustaining power supply system of the ocean data buoy provided by an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the wave energy generation and photovoltaic power generation as well as the battery charging capacity obtained from a battery charging simulation process performed at a time of 1:6 for three built-in direct-drive wave power generation devices and photovoltaic power generation devices provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] Embodiments of the present invention provide a wave-powered photovoltaic self-sustaining power supply system for an ocean data buoy and its control method. These systems integrate a multi-machine, parallel-connected, internal direct-drive wave power generation device and a photovoltaic power generation system to provide self-sustaining power for the ocean data buoy. This wave-powered photovoltaic self-sustaining power supply control method is implemented using a power electronics control system and voltage, current, and position sensor detection devices, as provided in embodiments of the present invention. The control system utilizes a combination of hardware and software.

[0042] like Figure 1 As shown, the present invention provides a wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, including: a multi-machine parallel system, including several independently moving built-in direct-drive wave power generation devices.

[0043] Solar photovoltaic panels are installed on the outside of the ocean data buoy.

[0044] The battery system is configured to store the electrical energy generated by the built-in direct-drive wave power generation device and the solar photovoltaic panels and release it according to control.

[0045] The power electronic control system is configured to implement MPPT control of wave energy-photovoltaic and battery charging based on a DSP controller.

[0046] In some embodiments of the present application, the built-in direct-drive wave power generation device includes a cabin, a bracket, a transmission mechanism and a core power generation unit, and the core power generation unit includes a magnetic screw rotor, a sprocket mechanism, a permanent magnet synchronous generator and a position sensor; the two ends of the bracket are installed on the side walls of the cabin, the transmission mechanism is arranged between the brackets, the permanent magnet synchronous generator is connected to the transmission mechanism through a magnetic screw rotor and a sprocket mechanism, and the position sensor is arranged at one end of the bracket; the three-phase output end of the permanent magnet synchronous generator is connected to the wave energy input end of the boost circuit to realize MPPT control of the built-in direct-drive wave power generation device, and the output end of the boost circuit is connected to the input end of the step-down chopper circuit to realize control of battery charging.

[0047] In some embodiments of the present application, the solar photovoltaic panel is configured to absorb solar radiation to generate electrical energy, the output end of the solar photovoltaic panel is connected to the photovoltaic input end of the power electronic control circuit through a capacitor, and the generated electrical energy is transmitted to the battery to charge the battery.

[0048] In some embodiments of the present application, the power electronic control system is configured to implement MPPT control of a built-in direct-drive wave power generation device and MPPT control of photovoltaic power generation of a solar photovoltaic panel based on a DSP controller, and to control a step-down chopper circuit for wave energy generation.

[0049] The present invention also discloses a control method for a wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, which is used to apply the above-mentioned wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, including: S100, MPPT control of a built-in direct-drive wave power generation device, specifically:

[0050] S110, real-time acquisition of the motion position signal of the core power generation unit of the built-in direct-drive wave power generation device in the multi-machine parallel system, the capacitor voltage signal of the rectifier output end of the permanent magnet synchronous generator, and the inductor current signal of the boost circuit.

[0051] S120, determining the motion reference position X of the core power generation unit ref The position error signal between the real-time position X detected by the position sensor is adjusted using a PI controller to obtain the position reference voltage U pos_ref .

[0052] S130, collects the capacitor voltage U at the rectifier output end of the permanent magnet synchronous generator in real time through the DSP controller dc and the inductor current I dc, the optimal reference voltage U is obtained by hill climbing method wave_MPPT , and use the PI controller to adjust the MPPT reference voltage U MPPT_ref .

[0053] S140, determining the position reference voltage U pos_ref and MPPT reference voltage U MPPT_ref The sum value is set as the final capacitor reference voltage U at the output end of the permanent magnet synchronous generator rectifier. dc_ref .

[0054] S150, using a PI controller to calculate a duty cycle D, and generating a PWM signal for a built-in direct-drive wave power generation device, so as to track the capacitor voltage at the rectifier output end of the permanent magnet synchronous generator.

[0055] S200, MPPT control of photovoltaic power generation, specifically:

[0056] S210, real-time acquisition of the output voltage U on the solar photovoltaic panel pv And the output current signal I pv .

[0057] S220, dynamically adjust the optimal working point U of photovoltaic power generation through the hill climbing method pv_MPPT Make the solar photovoltaic panels always work at the position of maximum power output.

[0058] S230, and using a PI controller to calculate the duty cycle D of the photovoltaic boost circuit, generating a PWM signal for the photovoltaic power generation device to achieve MPPT control of photovoltaic power generation.

[0059] S300, control of the charging circuit, specifically:

[0060] S310, real-time acquisition of the output terminal capacitor voltage amplitude U of the built-in direct-drive wave power generation device MPPT boost circuit of the multi-machine parallel system wave_MPPT_out .

[0061] S320, determine the capacitor voltage amplitude U wave_MPPT_out The minimum input voltage threshold U for charging the battery with the step-down chopper circuit buck_in size.

[0062] S330, when U wave_MPPT_out >U buck_in , start the step-down chopper circuit to charge the battery.

[0063] S340, when U wave_MPPT_out <U buck_in , the switch tube of the step-down chopper circuit is turned off, and energy is accumulated for the output capacitor of the MPPT boost circuit of the built-in direct-drive wave power generation device in the multi-machine parallel system.

[0064] In this embodiment, Figure 2 This is a graph showing the power generation and gravitational work done by three built-in direct-drive wave power generation devices during a 60-second simulation of the wave energy-photovoltaic self-sustaining power supply system of the ocean data buoy provided by an embodiment of the present invention.

[0065] Specifically, three built-in direct-drive wave power generation devices are placed in the middle compartment of the ocean data buoy in an equilateral triangle arrangement. Then, through the joint simulation model, MPPT control is performed on each built-in direct-drive wave power generation device to obtain the power generation and gravity work curve of each PMSG (permanent magnet synchronous generator) as shown below: Figure 2 The simulation results show that the three built-in direct-drive wave generators can independently implement MPPT control and achieve multi-unit parallel operation. The graph shows that the energy conversion efficiency of the built-in direct-drive wave generator (numbered a), placed along the wave direction, is the highest at 37.2%, while the energy conversion efficiencies of the other two devices are 28.1% and 22.6%.

[0066] Figure 3 This is a schematic diagram of the wave energy generation and photovoltaic power generation as well as the battery charging capacity obtained from a battery charging simulation process performed at a time of 1:6 for three built-in direct-drive wave power generation devices and photovoltaic power generation devices provided by an embodiment of the present invention.

[0067] Specifically, three built-in direct-drive wave power generation devices are placed in the middle compartment of the ocean data buoy in an equilateral triangle arrangement, and the input power of photovoltaic power generation is assumed to be 100W. According to the evaluation, the average working time of photovoltaic power generation in a day is 4 hours, and the working time of the wave power generation device is 24 hours. In the joint simulation, the wave energy generation and photovoltaic power generation are respectively turned on at a time ratio of 1:6 to simulate the charging process of the storage battery, and the wave energy generation, photovoltaic power generation and battery charging amount are obtained as follows Figure 3 As shown. From the curve chart, it can be seen that after a period of time, the three built-in direct-drive wave power generation devices completed the charging process of the charging capacitor. After that, the step-down chopper circuit was turned on and the energy generated by the three wave energy power generation devices was stored in the battery. Its average power generation power was 27.4W. After 50 seconds, the photovoltaic power generation was connected, and the generated electricity was directly output to the battery through the MPPT boost circuit. Its average power generation power was 98W. According to the conditions designed in this embodiment, it is calculated that the three built-in direct-drive wave power generation devices and 100W photovoltaic power generation can charge the battery 1.05kWh in one day. It can meet the minimum power consumption of most marine data corruption at this stage.

[0068] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or a combination of software and hardware embodiments. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0070] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. The wave energy-photovoltaic self-sustaining power supply system of the ocean data buoy is characterized by: include: Multi-machine parallel system, including several independently moving built-in direct-drive wave power generation devices; Solar photovoltaic panels, installed on the outside of the ocean data buoy; a battery system configured to store electrical energy generated by the built-in direct-drive wave power generation device and the solar photovoltaic panels and to release it according to control; The power electronic control system is configured to implement MPPT control of wave energy-photovoltaic and battery charging based on a DSP controller.

2. The wave energy-photovoltaic self-sustaining power supply system for ocean data buoy according to claim 1, characterized in that: The built-in direct-drive wave power generation device includes a cabin, a bracket, a transmission mechanism and a core power generation unit, and the core power generation unit includes a magnetic screw rotor, a sprocket mechanism, a permanent magnet synchronous generator and a position sensor; Both ends of the bracket are mounted on the side walls of the cabin, the transmission mechanism is arranged between the brackets, the permanent magnet synchronous generator is connected to the transmission mechanism via a magnetic screw rotor and a sprocket mechanism, and the position sensor is arranged at one end of the bracket; The three-phase output end of the permanent magnet synchronous generator is connected to the wave energy input end of the boost circuit to realize MPPT control of the built-in direct-drive wave power generation device, and the output end of the boost circuit is connected to the input end of the step-down chopper circuit to realize control of battery charging.

3. The wave energy-photovoltaic self-sustaining power supply system for ocean data buoy according to claim 1, characterized in that: The solar photovoltaic panel is configured to absorb solar radiation to generate electrical energy. The output end of the solar photovoltaic panel is connected to the photovoltaic input end of the power electronic control circuit through a capacitor, and the generated electrical energy is transmitted to the battery to charge the battery.

4. The wave energy-photovoltaic self-sustaining power supply system for ocean data buoy according to claim 1, characterized in that: The power electronic control system is configured to implement MPPT control of a built-in direct-drive wave power generation device and MPPT control of photovoltaic power generation of a solar photovoltaic panel based on a DSP controller, and to control a step-down chopper circuit for wave energy power generation.

5. A control method for a wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy, for use with the wave energy-photovoltaic self-sustaining power supply system for an ocean data buoy according to any one of claims 1 to 4, characterized in that: include: S100, built-in MPPT control for direct-drive wave power generation devices, specifically: S110, real-time acquisition of the motion position signal of the core power generation unit of the built-in direct-drive wave power generation device in the multi-machine parallel system, the capacitor voltage signal of the rectifier output end of the permanent magnet synchronous generator, and the inductor current signal of the boost circuit; S120, determining the motion reference position X of the core power generation unit ref The position error signal between the real-time position X detected by the position sensor is adjusted using a PI controller to obtain the position reference voltage U pos_ref ; S130, collects the capacitor voltage U at the rectifier output end of the permanent magnet synchronous generator in real time through the DSP controller dc and the inductor current I dc , the optimal reference voltage U is obtained by hill climbing method wave_MPPT , and use the PI controller to adjust the MPPT reference voltage U MPPT_ref ; S140, determining the position reference voltage U pos_ref and MPPT reference voltage U MPPT_ref The sum value is set as the final capacitor reference voltage U at the output end of the permanent magnet synchronous generator rectifier. dc_ref ; S150, using a PI controller to calculate a duty cycle D and generate a PWM signal for the built-in direct-drive wave power generation device to track the capacitor voltage at the rectifier output end of the permanent magnet synchronous generator; S200, MPPT control of photovoltaic power generation, specifically: S210, real-time acquisition of the output voltage U on the solar photovoltaic panel pv And the output current signal I pv ; S220, dynamically adjust the optimal working point U of photovoltaic power generation through the hill climbing method pv_MPPT Make the solar photovoltaic panels always work at the position of maximum power output; S230, and using a PI controller to calculate the duty cycle D of the photovoltaic boost circuit, generating a PWM signal for the photovoltaic power generation device to achieve MPPT control of the photovoltaic power generation; S300, control of the charging circuit, specifically: S310, real-time acquisition of the output terminal capacitor voltage amplitude U of the built-in direct-drive wave power generation device MPPT boost circuit of the multi-machine parallel system wave_MPPT_out ; S320, determine the capacitor voltage amplitude U wave_MPPT_out The minimum input voltage threshold U for charging the battery with the step-down chopper circuit buck_in size; S330, when U wave_MPPT_out >U buck_in , start the step-down chopper circuit to charge the battery; S340, when U wave_MPPT_out <U buck_in , the switch tube of the step-down chopper circuit is turned off, and energy is accumulated for the output capacitor of the MPPT boost circuit of the built-in direct-drive wave power generation device in the multi-machine parallel system.

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