Marine photovoltaic energy storage inverter

Abstract

The invention provides a marine photovoltaic energy storage inverter, which relates to the technical field of marine equipment and comprises a photovoltaic cell panel DC1, a storage battery DC2, a direct current filtering module, a boosting module, an inversion module, an alternating current filtering module and a control module. The photovoltaic cell panel DC1 and the storage battery DC2 serve as direct current input and are connected with the direct current filtering module, the direct current filtering module is connected with the boosting module, the boosting module is connected with the inversion module, the inversion module is connected with the alternating current filtering module, and the alternating current filtering module is connected with the control module. According to the invention, the design of double direct current filtering units is adopted, the interference of the input ends of the photovoltaic cell panel DC1 and the storage battery DC2 is effectively filtered, and the purity and stability of the marine direct current are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment, and in particular to a marine photovoltaic energy storage inverter. Background Art

[0002] With the increasing awareness of global environmental protection and the profound transformation of energy structure, the application of photovoltaic energy storage technology in the field of ships has become an important direction to promote the green and low-carbon development of the shipping industry. The core of this technology is to use photovoltaic modules to efficiently convert solar energy into electrical energy, and optimize energy management through advanced energy storage systems, thereby achieving energy conservation, emission reduction and environmental protection benefits during the operation of ships.

[0003] At present, a series of technical problems still need to be solved when applying photovoltaic energy storage technology to ships. First, the photovoltaic output power is unstable, and its curve is often quite different from the ship load curve, and both are affected by a variety of unpredictable factors such as weather and environment. This requires the ship photovoltaic energy storage inverter to have highly flexible adjustment capabilities and fast response mechanisms to ensure the stable operation of the ship's power system. Secondly, the complexity of the ship's power system puts higher requirements on the design of the ship's photovoltaic energy storage inverter. In hybrid power system ships, the sources of electricity are diverse, including generators, photovoltaic power generation systems, and power storage batteries. The inverter needs to be able to accurately identify and adapt to the switching of different power solutions to achieve effective power management and load distribution. In addition, considering the limited space of the ship and the complex operating environment, the ship's photovoltaic energy storage inverter must also have the characteristics of small size, light weight, strong anti-seismic and anti-shock capabilities to meet the stringent requirements of the actual operation of the ship.

[0004] Therefore, a marine photovoltaic energy storage inverter is proposed. Summary of the invention

[0005] This manual provides a marine photovoltaic energy storage inverter, which adopts a dual DC filter unit design to effectively filter out interference from the photovoltaic panel DC1 and battery DC2 input terminals, ensuring the purity and stability of the marine DC power.

[0006] This specification provides a marine photovoltaic energy storage inverter, including: photovoltaic panel DC1, battery DC2, DC filter module, boost module, inverter module, AC filter module, control module;

[0007] The photovoltaic panel DC1 and the battery DC2 are connected to the DC filter module as DC inputs, the DC filter module is connected to the boost module, the boost module is connected to the inverter module, the inverter module is connected to the AC filter module, and the AC filter module is connected to the control module.

[0008] Optionally, the DC filtering module includes: a first DC filtering unit and a second DC filtering unit;

[0009] The photovoltaic panel DC1 is connected to the first DC filter unit, which includes a common-mode inductor L1 and a capacitor C1 connected in parallel; the battery DC2 is connected to the second DC filter unit, which includes a common-mode inductor L2 and a capacitor C2 connected in parallel, and both the first DC filter unit and the second DC filter unit are connected to the boost module.

[0010] Optionally, the boost module includes: a maximum power point tracking control solar controller MPPT1, and a maximum power point tracking control solar controller MPPT2;

[0011] The common-mode inductor L1 is connected to the maximum power point tracking control solar controller MPPT1, the common-mode inductor L2 is connected to the maximum power point tracking control solar controller MPPT2, the maximum power point tracking control solar controller MPPT1 is respectively connected to the capacitor C3 and the maximum power point tracking control solar controller MPPT2, and the capacitor C1 is connected to the inverter module.

[0012] Optionally, the inverter module includes an insulated gate transistor IGBT1;

[0013] The capacitor C1 is connected to the insulated gate transistor IGBT1, and the switching frequency and duty cycle of the insulated gate transistor IGBT1 are adjusted by the control module, thereby controlling the output voltage and current waveform of the control module, and connecting it to the AC filter module.

[0014] Optionally, the AC filter module includes: a relay KJ1, a third AC filter unit, a varistor R1, and a varistor R2;

[0015] The insulated gate transistor IGBT1 is connected to the relay KJ1, the relay KJ1 is connected to the third AC filter unit, the third AC filter unit includes a common mode inductor L3 and a capacitor C4 connected in parallel, and the third AC filter unit is connected to the varistor R1 and the varistor R2 respectively.

[0016] Optionally, the control module includes: a control unit, an auxiliary power supply VBAT1; the control unit includes a main digital signal processor DSP1 and a secondary digital signal processor DSP2 connected to each other;

[0017] The auxiliary power supply VBAT1 is connected to the insulated gate transistor IGBT1, the control unit, and the relay KJ1 respectively.

[0018] Optionally, it also includes: a transmission module connected to the control unit; the transmission module includes an RS485 communication component and a liquid crystal display screen.

[0019] Optionally, it also includes: the relay KJ1 includes at least one of a grid-connected relay, an off-grid relay, and a bypass relay.

[0020] In this manual, a dual DC filter unit design is adopted to effectively filter out interference from the input ends of the photovoltaic panel DC1 and the battery DC2 to ensure the purity and stability of the DC power. By equipping two maximum power point tracking control solar controllers (MPPT1 and MPPT2), the inverter can optimize the power output of the photovoltaic panel DC1 and the battery DC2 respectively to achieve efficient utilization. The inverter module adopts an insulated gate transistor (IGBT1), and its switching frequency and duty cycle are adjusted by a precise control module to accurately control the output voltage and current waveform to ensure the output quality of the AC power. In addition, the AC filter module includes a relay KJ1 (optionally at least one of the grid-connected, off-grid, and bypass relays) and a filter component to cope with the complex ship operating environment and ensure the stable operation of the power system. The control module is not only equipped with primary and secondary digital signal processors (DSP1 and DSP2), but also connected to the transmission module, supporting RS485 communication and LCD display, which is convenient for remote monitoring and local operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a marine photovoltaic energy storage inverter provided in an embodiment of this specification;

[0023] Figure 2 A schematic diagram of the principle of a marine photovoltaic energy storage inverter provided in an embodiment of this specification;

[0024] Figure 3 A schematic diagram of the control principle diagram of the energy storage boost and inversion part of a marine photovoltaic energy storage inverter provided in an embodiment of this specification.

[0025] The accompanying drawings illustrate: 100, DC filter module; 200, boost module; 300, inverter module; 400, AC filter module; 500, control module. DETAILED DESCRIPTION

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0027] The following is combined with Figure 1-3 The exemplary embodiments of the present invention are described more fully. However, the exemplary embodiments can be implemented in various forms, and it should not be understood that the present invention is limited to the embodiments set forth herein. On the contrary, providing these exemplary embodiments can make the present invention more comprehensive and complete, and it is more convenient to fully convey the inventive concept to those skilled in the art. The same reference numerals in the figures represent the same or similar elements, components or parts, and thus their repeated description will be omitted.

[0028] Under the premise of being consistent with the technical concept of the present invention, the features, structures, characteristics or other details described in a specific embodiment do not exclude that they can be combined in one or more other embodiments in a suitable manner.

[0029] In the description of specific embodiments, the features, structures, characteristics or other details described in the present invention are intended to enable those skilled in the art to fully understand the embodiments. However, it does not exclude that those skilled in the art can practice the technical solutions of the present invention without one or more of the specific features, structures, characteristics or other details.

[0030] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0031] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0032] The term "and / or" or "and / or" includes all combinations of any one or more of the associated listed items.

[0033] Figure 1 A schematic diagram of the structure of a marine photovoltaic energy storage inverter provided in an embodiment of this specification includes:

[0034] Photovoltaic panel DC1, battery DC2, DC filter module 100, boost module 200, inverter module 300, AC filter module 400, control module 500;

[0035] The photovoltaic panel DC1 and the battery DC2 are connected to the DC filter module as DC inputs, the DC filter module is connected to the boost module, the boost module is connected to the inverter module, the inverter module is connected to the AC filter module, and the AC filter module is connected to the control module.

[0036] In the specific implementation of this specification, the photovoltaic panel DC1 is the starting point of energy conversion, which converts solar energy into direct current electricity. As an energy storage device, the battery DC2 can provide direct current electricity to the system when there is insufficient light or at night. The photovoltaic panel DC1 and the battery DC2 are used as direct current input sources. The direct current electricity from the photovoltaic panel DC1 and the battery DC2 is filtered by the direct current filter module to remove the ripple and noise therein, ensure the quality of the electric energy, and output the filtered direct current to the boost module. The filtered direct current electricity is boosted to a voltage range suitable for the operation of the inverter module by the boost module, and the boosted direct current is transferred to the inverter module. The boosted direct current electricity is converted into alternating current electricity by the inverter module for use by household or industrial electrical equipment, and the converted alternating current is transferred to the alternating current filter module. The alternating current electricity output by the inverter module is filtered by the alternating current filter module to remove harmonics and noise, improve the quality of the electric energy, and output the filtered alternating current to the load or the power grid. Through the control module: monitor and control the entire marine photovoltaic energy storage inverter system, including the monitoring of parameters such as voltage, current, power factor, and adjust the system working status according to factors such as light intensity and load demand.

[0037] Through the cooperation of the boost module and the inverter module, efficient conversion from solar energy to AC power is achieved. The use of DC filter module and AC filter module improves the purity of electric energy and the stability of the system. As an energy storage device, the battery DC2 can provide electric energy when the light is insufficient, which enhances the flexibility and adaptability of the system. The control module can monitor and control the system status in real time to ensure that the system can operate stably under various conditions. Making full use of solar energy resources reduces the dependence on traditional energy, which is in line with the development trend of green and low carbon.

[0038] Optionally, the DC filtering module includes: a first DC filtering unit and a second DC filtering unit;

[0039] The photovoltaic panel DC1 is connected to the first DC filter unit, which includes a common-mode inductor L1 and a capacitor C1 connected in parallel; the battery DC2 is connected to the second DC filter unit, which includes a common-mode inductor L2 and a capacitor C2 connected in parallel, and both the first DC filter unit and the second DC filter unit are connected to the boost module.

[0040] In the specific implementation of this specification, Figure 2 As shown, the first DC filter unit is composed of a common mode inductor L1 and a capacitor C1 in parallel. The common mode inductor L1 is mainly used to suppress the common mode noise in the power line, that is, the interference signal between the two lines and the ground. The capacitor C1 is used to filter out the high frequency noise and ripple in the DC power to ensure that the output DC power is smoother and more stable.

[0041] Similar to the first DC filter unit, the second DC filter unit is composed of a common mode inductor L2 and a capacitor C2 in parallel. The functions of the common mode inductor L2 and the capacitor C2 are the same as those of L1 and C1 in the first unit, but they are for the DC power output by the battery DC2.

[0042] Through two independent DC filter units, the DC outputs of the photovoltaic panel DC1 and the battery DC2 are filtered respectively, effectively removing the interference and noise, and improving the power quality of the system. Fine filtering helps to reduce harmonics and noise in the system, thereby enhancing the stability and reliability of the entire marine photovoltaic energy storage inverter system. Subdividing the DC filter module into two units not only facilitates the maintenance and upgrade of the system, but also improves the flexibility and scalability of the system. This modular design allows the system to be customized and optimized according to actual needs. High-quality DC power is input into the boost module and inverter module, which helps to reduce energy loss and improve the conversion efficiency of the entire system.

[0043] Optionally, the boost module includes: a maximum power point tracking control solar controller MPPT1, and a maximum power point tracking control solar controller MPPT2;

[0044] The common-mode inductor L1 is connected to the maximum power point tracking control solar controller MPPT1, the common-mode inductor L2 is connected to the maximum power point tracking control solar controller MPPT2, the maximum power point tracking control solar controller MPPT1 is respectively connected to the capacitor C3 and the maximum power point tracking control solar controller MPPT2, and the capacitor C1 is connected to the inverter module.

[0045] In the specific implementation of this specification, the maximum power point tracking control solar controller MPPT1 calculates the current maximum power point (MPP) by real-time monitoring the output voltage and current of the photovoltaic panel DC1, and adjusts its internal circuit to ensure that the photovoltaic panel DC1 always operates near the maximum power point. In this way, even if the lighting conditions change, the maximum power point tracking control solar controller MPPT1 can ensure that the photovoltaic panel DC1 outputs as much electrical energy as possible.

[0046] The maximum power point tracking control solar controller MPPT1 is also connected to capacitor C3, which may be used to smooth the power at the output of the maximum power point tracking control solar controller MPPT1 to reduce ripple. At the same time, the maximum power point tracking control solar controller MPPT1 is also connected to the maximum power point tracking control solar controller MPPT2, which is usually to achieve information sharing or coordinated control between the two MPPT controllers.

[0047] Similar to the maximum power point tracking control solar controller MPPT1, the maximum power point tracking control solar controller MPPT2 is also responsible for monitoring the output voltage and current of the battery DC2, calculating and adjusting its operating point to maximize the power output of the battery DC2. This is especially important when the battery DC2 is powered when there is insufficient sunlight or at night.

[0048] The boost module optimizes the power output of the photovoltaic panel DC1 and the battery DC2 through the maximum power point tracking control solar controller MPPT1 and the maximum power point tracking control solar controller MPPT2 respectively, and boosts the power to a voltage range suitable for the operation of the inverter module, which not only improves the energy conversion efficiency of the system, but also enhances the flexibility and adaptability of the system.

[0049] Optionally, the inverter module includes an insulated gate transistor IGBT1;

[0050] The capacitor C1 is connected to the insulated gate transistor IGBT1, and the switching frequency and duty cycle of the insulated gate transistor IGBT1 are adjusted by the control module, thereby controlling the output voltage and current waveform of the control module, and connecting it to the AC filter module.

[0051] In the specific implementation of this specification, the insulated gate transistor IGBT1 is the core switching element in the inverter module, and its input end (gate) is connected to the control module, and the output end (collector and emitter) is connected to the DC power supply (DC power after filtering and boosting) and the AC filter module. The insulated gate transistor IGBT1 converts DC power into AC power through fast switching action. Its switching frequency and duty cycle determine the voltage and current waveform of the output AC power.

[0052] The control module controls the switching action of the insulated gate transistor IGBT1 by adjusting the gate voltage of the insulated gate transistor IGBT1. Specifically, the control module generates a PWM (pulse width modulation) signal, the frequency and duty cycle of which determine the switching frequency and duty cycle of the IGBT1.

[0053] Optionally, the AC filter module includes: a relay KJ1, a third AC filter unit, a varistor R1, and a varistor R2;

[0054] The insulated gate transistor IGBT1 is connected to the relay KJ1, the relay KJ1 is connected to the third AC filter unit, the third AC filter unit includes a common mode inductor L3 and a capacitor C4 connected in parallel, and the third AC filter unit is connected to the varistor R1 and the varistor R2 respectively.

[0055] In the specific implementation of the present specification, the relay KJ1 is used to disconnect the circuit when the system is started, shut down or encounters a fault to protect the subsequent circuit from damage. It can also be used to switch different circuit paths or loads.

[0056] The common mode inductor L3 and the capacitor C3 are connected in parallel to form a filter network for filtering out high frequency noise and interference in the AC signal and improving the power quality.

[0057] Varistors are nonlinear components whose resistance decreases as voltage increases. In circuits, they are often used for overvoltage protection. When the system voltage exceeds the threshold of the varistor, they will quickly turn on, thereby limiting the further increase in voltage and protecting subsequent circuits and equipment from damage.

[0058] Optionally, the control module includes: a control unit, an auxiliary power supply VBAT1; the control unit includes a main digital signal processor DSP1 and a secondary digital signal processor DSP2 connected to each other;

[0059] The auxiliary power supply VBAT1 is connected to the insulated gate transistor IGBT1, the control unit, and the relay KJ1 respectively.

[0060] In the specific implementation of the present specification, the control unit is formed by interconnecting a main digital signal processor DSP1 and a secondary digital signal processor DSP2. The main digital signal processor DSP1 and the secondary digital signal processor DSP2 are connected via an internal communication bus or interface to achieve data exchange and collaborative work. The main digital signal processor DSP1, as the core controller of the system, is responsible for processing complex algorithms and control logics, such as the generation of PWM (pulse width modulation) signals, system status monitoring, fault diagnosis, etc. The secondary digital signal processor DSP2 is used to process some auxiliary tasks, such as real-time data acquisition, preprocessing or simple control logic, to reduce the burden of the main DSP or provide additional functions.

[0061] Optionally, it also includes: a transmission module connected to the control unit; the transmission module includes an RS485 communication component and a liquid crystal display screen.

[0062] In the specific implementation of this specification, RS485 is a serial communication protocol of differential transmission, with the advantages of long transmission distance, strong anti-interference ability, etc. In the transmission module, the RS485 communication part is used to realize the remote communication with other devices (such as host computer, other control systems, etc.). The RS485 communication part is usually connected to external devices through the RS485 interface of standard, and differential signals are used to transmit data. In power electronic systems, the RS485 communication part can be used for functions such as remote monitoring, data acquisition, fault diagnosis of monitoring systems.

[0063] The LCD is used to display the system status information, parameter settings, alarm information, etc. It provides an intuitive interface for users to understand the system's operating status and perform corresponding operations. The LCD is usually connected to the control unit through a parallel interface, a serial interface (such as SPI, I2C, etc.) or a dedicated display interface. The type and specification of the LCD can be selected according to the needs of the system, such as character display, graphic display, etc.

[0064] Optionally, it also includes: the relay KJ1 includes at least one of a grid-connected relay, an off-grid relay, and a bypass relay.

[0065] In the specific implementation of this specification, the grid-connected relay is generally used to control the connection between the power system and the power grid. When the system needs to supply power to the power grid or obtain power from the power grid, the grid-connected relay will be activated or disconnected to achieve grid-connected or off-grid operation of the system and the power grid. In renewable energy systems such as solar power generation systems, wind power generation systems, and energy storage systems, the grid-connected relay is an indispensable component. It allows the system to automatically connect to the power grid when certain conditions are met to supply power to the power grid or obtain power from the power grid.

[0066] Off-grid relays are the opposite of grid-connected relays. Off-grid relays are used to protect the system when it is disconnected from the grid. When the grid fails or the system needs to operate independently, the off-grid relay will be activated to ensure electrical isolation between the system and the grid. Off-grid relays play an important role in scenarios such as island operation, emergency power systems, and power supply to remote areas. It allows the system to continue to operate when the grid is unavailable and provide stable power to critical loads.

[0067] Bypass relays are often used to bypass a device or component during maintenance or failure. When a part of a system needs to be repaired or replaced, the bypass relay can be activated to direct the current from that part to an alternate path, thus ensuring that the rest of the system can continue to operate. Bypass relays are common components in systems that require high reliability and availability, such as UPS (Uninterruptible Power Supply) systems, data center power systems, and industrial control systems. They allow the system to automatically switch to an alternate path in the event of a failure to reduce downtime and data loss.

[0068] like Figure 3 As shown, Vpv is the input voltage of the photovoltaic panel DC1, Ipv is the input current of the photovoltaic panel DC1, Vdcref is determined according to the input voltage and input current, Vderef is the given value of the maximum power tracking (MPPT) of the photovoltaic panel DC1, Vdcsample is the input voltage sampling value of the photovoltaic panel DC1, Vsample is the voltage sampling value after boosting, Vref is the given value of the voltage after boosting, IL is the sampling value of the boost inductor current, and DW1 is the control duty cycle of QW1. The working method of the MPPT control strategy is: the voltage (Vpv) and current (Ipv) are calculated by comparing the input power to obtain the (MPPT) Vdcref given value, and the error between Vdcref and Vdcsample is calculated by the PI loop. The error between Vref and the voltage sampling value after boosting (Vsample) is calculated through the PI loop, and the error between Vdcref and Vdcsample is added through the PI loop to get the inductor current loop given value (Idcref). The error between the inductor current loop given value (Idcref) and the sampling value of the inductor current (IL) is calculated through the P calculation, and finally the DW1 modulation ratio is calculated. DW1 is compared with the triangular carrier to generate a modulated square wave (QW1). The QW1 modulation signal drives the ICBT to achieve output voltage regulation and MPPT tracking functions.

[0069] In this manual, a dual DC filter unit design is adopted to effectively filter out interference from the input ends of the photovoltaic panel DC1 and the battery DC2 to ensure the purity and stability of the DC power. By equipping two maximum power point tracking control solar controllers (MPPT1 and MPPT2), the inverter can optimize the power output of the photovoltaic panel DC1 and the battery DC2 respectively to achieve efficient utilization. The inverter module adopts an insulated gate transistor (IGBT1), and its switching frequency and duty cycle are adjusted by a precise control module to accurately control the output voltage and current waveform to ensure the output quality of the AC power. In addition, the AC filter module includes a relay KJ1 (optionally at least one of the grid-connected, off-grid, and bypass relays) and a filter component to cope with the complex ship operating environment and ensure the stable operation of the power system. The control module is not only equipped with primary and secondary digital signal processors (DSP1 and DSP2), but also connected to the transmission module, supporting RS485 communication and LCD display, which is convenient for remote monitoring and local operation.

[0070] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the present invention is not inherently related to any specific computer, virtual device or electronic device, and various general devices can also implement the present invention. The above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0072] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A marine photovoltaic energy storage inverter, characterized in that: include: Photovoltaic panel DC1, battery DC2, DC filter module, boost module, inverter module, AC filter module, control module; The photovoltaic panel DC1 and the battery DC2 are connected to the DC filter module as DC inputs, the DC filter module is connected to the boost module, the boost module is connected to the inverter module, the inverter module is connected to the AC filter module, and the AC filter module is connected to the control module.

2. The marine photovoltaic energy storage inverter according to claim 1, characterized in that: The DC filtering module includes: a first DC filtering unit and a second DC filtering unit; The photovoltaic panel DC1 is connected to the first DC filter unit, which includes a common-mode inductor L1 and a capacitor C1 connected in parallel; the battery DC2 is connected to the second DC filter unit, which includes a common-mode inductor L2 and a capacitor C2 connected in parallel, and both the first DC filter unit and the second DC filter unit are connected to the boost module.

3. The marine photovoltaic energy storage inverter according to claim 2, characterized in that: The boost module includes: a maximum power point tracking control solar controller MPPT1 and a maximum power point tracking control solar controller MPPT2; The common-mode inductor L1 is connected to the maximum power point tracking control solar controller MPPT1, the common-mode inductor L2 is connected to the maximum power point tracking control solar controller MPPT2, the maximum power point tracking control solar controller MPPT1 is respectively connected to the capacitor C3 and the maximum power point tracking control solar controller MPPT2, and the capacitor C1 is connected to the inverter module.

4. The marine photovoltaic energy storage inverter according to claim 3, characterized in that: The inverter module includes an insulated gate transistor IGBT1; The capacitor C1 is connected to the insulated gate transistor IGBT1, and the switching frequency and duty cycle of the insulated gate transistor IGBT1 are adjusted by the control module, thereby controlling the output voltage and current waveform of the control module, and connecting it to the AC filter module.

5. The marine photovoltaic energy storage inverter according to claim 4, characterized in that: The AC filter module includes: a relay KJ1, a third AC filter unit, a varistor R1, and a varistor R2; The insulated gate transistor IGBT1 is connected to the relay KJ1, the relay KJ1 is connected to the third AC filter unit, the third AC filter unit includes a common mode inductor L3 and a capacitor C4 connected in parallel, and the third AC filter unit is connected to the varistor R1 and the varistor R2 respectively.

6. The marine photovoltaic energy storage inverter according to claim 5, characterized in that: The control module comprises: a control unit, an auxiliary power supply VBAT1; the control unit comprises a main digital signal processor DSP1 and a secondary digital signal processor DSP2 connected to each other; The auxiliary power supply VBAT1 is connected to the insulated gate transistor IGBT1, the control unit, and the relay KJ1 respectively.

7. The marine photovoltaic energy storage inverter according to claim 6, characterized in that: Also includes: A transmission module connected to the control unit; the transmission module includes an RS485 communication component and a liquid crystal display screen.

8. The marine photovoltaic energy storage inverter according to claim 7, characterized in that: The relay KJ1 includes at least one of a grid-connected relay, an off-grid relay, and a bypass relay.

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