Power control circuit

Abstract

The application discloses an electric energy control circuit, comprising: a bidirectional DC / AC power distribution module, a maximum power point tracking module, a bidirectional DC / DC module, a battery system and a central controller; the bidirectional DC / AC power distribution module is connected with a DC bus on the DC side, and the AC side is used for connecting an external AC power supply or a load device to realize bidirectional conversion of AC and DC; the maximum power point tracking module is used for accessing new energy electric energy generated by a new energy power generation device, and charging the battery system or supplying power to the bidirectional DC / AC power distribution module connected with the DC bus through the bidirectional DC / DC module; the bidirectional DC / DC module is used for realizing charging and discharging functions of the battery system, and performing electric energy conversion with the bidirectional DC / AC power distribution module and / or the maximum power point tracking module; the battery system is used for storing and releasing electric energy; the central controller communicates and controls the battery system and each module through a communication bus, realizes switching of different working modes in multiple modes, and meets diversified demands in different environments.

Description

Technical Field

[0001] This application relates to the field of power supply technology, specifically to an electrical power control circuit. Background Technology

[0002] Traditional ships rely primarily on internal combustion engines for power, with generators supplying electricity for daily loads. This model leads to severe carbon emissions, contradicting current environmental protection principles. With the development of new energy technologies, the shipbuilding industry has begun exploring the use of new energy power generation equipment to supplement or replace traditional power supply. However, the application of new energy sources (such as solar and wind power) on ships also faces challenges of instability and intermittency. Numerous difficulties remain regarding the rational utilization and efficient integration of various energy sources. Summary of the Invention

[0003] This application provides an energy control circuit that can integrate multiple new energy power generation devices, improve the conversion efficiency of new energy, and change the energy flow of each module through a central controller to achieve multi-modal working mode switching to meet diverse needs in different environments.

[0004] This application provides an energy control circuit, including a bidirectional DC / AC power distribution module, a maximum power point tracking module, a bidirectional DC / DC module, a battery system, and a central controller; the bidirectional DC / AC power distribution module and the maximum power point tracking module are connected in parallel to the DC bus of the bidirectional DC / DC module, and the battery system is connected in parallel to the DC bus of the bidirectional DC / DC module;

[0005] The bidirectional DC / AC power distribution module has its DC side connected to the DC busbar and its AC side used to connect to an external AC power source or load device, realizing bidirectional conversion between AC and DC power.

[0006] The maximum power point tracking module is used to access the new energy power generated by the new energy power generation equipment, and to charge the battery system or supply power to the bidirectional DC / DC power distribution module connected to the DC bus through the bidirectional DC / AC power distribution module.

[0007] The bidirectional DC / DC module is used to realize the charging and discharging function of the battery system, and to perform power conversion with the bidirectional DC / AC power distribution module and / or the maximum power point tracking module;

[0008] The battery system is used to store and release electrical energy;

[0009] The central controller communicates and controls the battery system and various modules via a communication bus to achieve switching between different operating modes in the multi-modal operating mode.

[0010] This application provides an energy control circuit, including a bidirectional DC / AC power distribution module, a maximum power point tracking module, a bidirectional DC / DC module, a battery system, and a central controller. The bidirectional DC / AC power distribution module and the maximum power point tracking module are connected in parallel to the DC bus of the bidirectional DC / DC module, and the battery system is also connected in parallel to the DC bus of the bidirectional DC / DC module. The bidirectional DC / AC power distribution module has its DC side connected to the DC bus and its AC side used to connect to an external AC power source or load device, realizing bidirectional conversion between AC and DC power. The maximum power point tracking module is used to access new energy generated by new energy power generation equipment and to charge the battery system or supply power to the bidirectional DC / AC power distribution module connected to the DC bus through the bidirectional DC / DC module. The bidirectional DC / DC module is used to realize the charging and discharging function of the battery system and to perform energy conversion with the bidirectional DC / AC power distribution module and / or the maximum power point tracking module. The battery system is used to store and release electrical energy. The central controller communicates and controls the battery system and each module through a communication bus to realize the switching of different working modes in the multi-modal working mode. The power control circuit provided in this application integrates a bidirectional DC / AC power distribution module, a maximum power point tracking module, a bidirectional DC / DC module, a battery system, and a central controller to construct a highly efficient and flexible multi-energy bidirectional utilization system. It can integrate various new energy power generation equipment, improve the conversion efficiency of new energy, and change the energy flow of each module through the central controller to realize multi-modal working mode switching to meet diverse needs in different environments. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the power control circuit provided in an embodiment of this application.

[0013] Figure 2 This is a schematic diagram of the structure of the bidirectional DC / AC power distribution module provided in the embodiments of this application.

[0014] Figure 3 This is a schematic diagram of a scenario for the first rectification mode provided in an embodiment of this application.

[0015] Figure 4 This is a schematic flowchart illustrating the condition detection process for the first rectification mode provided in an embodiment of this application.

[0016] Figure 5This is a schematic diagram of a second rectification mode provided in an embodiment of this application.

[0017] Figure 6 This is a schematic flowchart illustrating the condition detection process for the second rectification mode provided in an embodiment of this application.

[0018] Figure 7 This is a schematic diagram of the inverter mode provided in the embodiments of this application.

[0019] Figure 8 This is a schematic flowchart illustrating the condition detection process for the inverter mode provided in an embodiment of this application.

[0020] Figure 9 This is a schematic diagram of a first new energy power supply mode provided in an embodiment of this application.

[0021] Figure 10 This is a schematic diagram of the condition detection process for the first new energy power supply mode and the second new energy power supply mode provided in the embodiments of this application.

[0022] Figure 11 This is a schematic diagram of a second new energy power supply mode provided in an embodiment of this application.

[0023] Figure 12 This is a schematic diagram of a scenario for the third new energy power supply mode provided in the embodiments of this application.

[0024] Figure 13 This is a schematic diagram of the condition detection process for the third new energy power supply mode provided in the embodiments of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0030] For details, please refer to Figures 1 to 13 This application provides a power control circuit 10. The power control circuit 10 includes a bidirectional DC / AC power distribution module 1, a maximum power point tracking module 2, a bidirectional DC / DC module 3, a battery system 4, and a central controller 5; the bidirectional DC / AC power distribution module 1 and the maximum power point tracking module 2 are connected in parallel to the DC bus 31 of the bidirectional DC / DC module 3, and the battery system 4 is connected in parallel to the DC bus 31 of the bidirectional DC / DC module 3.

[0031] The bidirectional DC / AC power distribution module 1 connects to the DC bus 31 on its DC side and connects to an external AC power source 20 or load device 30 on its AC side, enabling bidirectional conversion between AC and DC power. This module is a bidirectional DC / AC converter, capable of efficiently converting AC to DC power in both directions. It can handle both obtaining power from an external power source and converting DC power to AC power to supply loads or connect to the grid. For example, a single bidirectional DC / AC power distribution module 1 has a power of 5.5kW and can support up to 6 machines operating in parallel, with a total power of 33kW. This module can operate bidirectionally. In forward operation, it provides low-ripple DC power for rectification and high-quality, harmonic-free sinusoidal AC power for reverse operation. It also integrates power distribution functionality, allowing connection to load devices 30 suitable for AC power for power supply and distribution.

[0032] like Figure 2As shown, the bidirectional DC / AC power distribution module 1 integrates power conversion and AC power distribution functions. It incorporates an LLC bidirectional DC / AC topology circuit 11, which achieves a constant output voltage resonant circuit by controlling the switching frequency of the automatic transfer switch 12. This enables forward and reverse rectification and inversion functions, reducing switching losses and extending equipment life through zero-voltage and zero-current start-up. Additionally, a power distribution circuit is used to implement power distribution functions, employing fuses and circuit breakers for selective protection of critical equipment. The power distribution circuit has two input power sources: an external AC power supply 20 (AC IN) as the main power supply, and a DC / AC inverter power supply as backup power, automatically switching between main and backup power. The bidirectional DC / AC power distribution module 1 has parallel connection capabilities, enabling communication between modules through a parallel communication harness, and distinguishing between master and slave modules for external communication. The master module receives external signals and then broadcasts them to each slave module. Each slave module maintains consistency with the master module, thus achieving consistent functional modes and current sharing at output.

[0033] The Maximum Power Point Tracking (MPPT) module 2 is used to connect to the renewable energy generated by the renewable energy power generation equipment 40, and to charge the battery system 4 or supply power to the bidirectional DC / DC distribution module 1 connected to the DC bus 31 via the bidirectional DC / DC module 3. For example, a single MPPT module 2 has a power of 5.5kW and can support up to 6 machines operating in parallel. This MPPT module 2 can achieve maximum power point tracking, ensuring maximum power output from unstable energy sources such as renewable energy, and improving energy conversion efficiency and utilization. The MPPT module 2 also has parallel connection functionality. Through the connection of the communication parallel wiring harness, communication between modules is achieved, and a master-slave distinction is made between modules for external communication. The master receives external signals and then broadcasts them to each slave. Each slave is consistent with the master, thereby achieving consistent functional modes and current sharing of output.

[0034] The bidirectional DC / DC module 3 is used to charge and discharge the battery system 4 and to convert power with the bidirectional DC / AC power distribution module 1 and / or the maximum power point tracking module 2. For example, a single bidirectional DC / DC module 3 has a power of 5.5kW and can support up to 6 machines operating in parallel, with a total power of 33kW. Voltage regulation is achieved through sinusoidal pulse width modulation (SPWM) technology, and with multiple energy inputs, the output power waveform remains stable. This bidirectional DC / DC module 3 is a bidirectional DC / DC converter with a bidirectional DC / DC topology. It employs a buck-boost bidirectional circuit, exhibiting high conversion efficiency and voltage regulation, and a simple structure with a small size. By switching the internal insulated-gate field-effect transistor (MOS), the duty cycle of the topology is adjusted, achieving stable voltage regulation and bidirectional energy transfer. The bidirectional DC / DC module 3 also has parallel operation capabilities. Communication between modules is achieved through a communication parallel harness, and master-slave communication is distinguished between modules. The master receives external signals and then broadcasts them to each slave. Each slave keeps in sync with the master, thus achieving consistent functional modes and output current sharing.

[0035] Battery system 4 is used to store and release electrical energy. For example, battery system 4 can be a lithium battery system with a battery voltage of 51.2V and a single battery capacity of 11.776kWh. Battery system 4 supports multiple batteries connected in parallel, with a maximum capacity of 94.208kWh for 8 batteries connected in parallel.

[0036] The central controller 5 communicates and controls the battery system 4 and its modules via a communication bus, enabling switching between different operating modes in the multi-modal operation mode. For example, the central controller 5 communicates and controls the battery system 4 and its modules via a CAN2.0B communication bus to achieve this switching. The central controller can receive external signals and adjust the operating status of each module according to the signal content to meet the different usage needs of users in different environments.

[0037] The power control circuit 10 provided in this application integrates advanced components and technologies such as a bidirectional DC / AC power distribution module 1, a maximum power point tracking module 2, a bidirectional DC / DC module 3, a battery system 4, and a central controller 5 to realize a highly efficient, flexible, and versatile multi-energy bidirectional utilization circuit system. This system not only improves the utilization rate and conversion efficiency of new energy sources but also meets the diverse needs of users in different environments, which is of great significance for promoting the widespread application of new energy technologies and the green transformation of the power system.

[0038] In some embodiments, the load device 30 includes at least one of a ship's electrical system, marine engineering equipment, and offshore operation equipment.

[0039] For example, the load equipment 30 is diverse, encompassing at least one of the following: ship electrical systems, marine engineering equipment, and offshore operation equipment. Specifically, ship electrical systems include not only propulsion motors to drive the ship forward but also onboard household appliances such as lighting, communication, and navigation equipment, ensuring the normal operation of the ship and the living needs of the crew. Marine engineering equipment includes drilling platform power supply systems, providing stable and reliable power support for offshore drilling operations. Offshore operation equipment, such as port cranes, also relies on this power control circuit to ensure its efficient and safe operation.

[0040] In some embodiments, the new energy power generation equipment 40 includes at least one of photovoltaic power generation equipment, wind power generation equipment, hydropower generation equipment, wave power generation equipment, tidal power generation equipment, and biomass power generation equipment. These devices can fully utilize various renewable energy sources in nature, converting them into new energy electrical energy to provide a continuous energy input for the power control circuit.

[0041] Photovoltaic power generation equipment uses solar panels to directly convert solar energy into electrical energy. It has advantages such as being pollution-free and widely distributed, making it suitable for installation and use in areas with abundant sunshine.

[0042] Wind power generation equipment converts wind energy into electrical energy through wind turbines. Wind energy is a clean and renewable energy source, and in areas rich in wind resources, wind power generation equipment can generate electricity on a large scale.

[0043] Hydropower equipment converts the kinetic and potential energy of water flow into electrical energy. It is usually built in water bodies such as rivers and lakes with abundant water resources and features high power generation efficiency and stable operation.

[0044] Wave energy generation equipment can capture the energy of ocean waves and convert it into electrical energy to provide power for electrical equipment in the marine environment.

[0045] Tidal power generation equipment uses the energy generated by the rise and fall of tides to generate electricity. Tidal energy is a regular and predictable energy source.

[0046] Biomass power generation equipment generates electricity by burning biomass materials or by utilizing the gases produced by biomass fermentation.

[0047] New energy sources, including those generated by the aforementioned new energy power generation equipment 40, possess numerous advantages such as being clean, renewable, and environmentally friendly. New energy sources not only reduce dependence on fossil fuels and lower environmental pollution, but also promote the optimization and transformation of the energy structure. In the power control circuit, the new energy source, after optimization by the maximum power point tracking module, can be utilized more efficiently, providing a stable and reliable power supply to the load equipment. Simultaneously, through the energy storage and release functions of the battery system, new energy sources can also achieve flexible application across time periods and regions, further enhancing the practicality and economy of the entire power control circuit system.

[0048] In some embodiments, the central controller 5 is configured to automatically switch to the corresponding operating mode in the multi-modal operating mode by real-time monitoring of the voltage input status, the access status of the battery system 4, the access status of the external AC power supply 20, the load demand power of the load device 30, and the input status of the new energy power.

[0049] In some embodiments, the multimodal operating modes include a first rectification mode, a second rectification mode, an inverter mode, a first new energy power supply mode, a second new energy power supply mode, and a third new energy power supply mode.

[0050] In some embodiments, such as Figure 3 and Figure 4 As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is connected and the state of charge is lower than the preset standard value, the external AC power supply 20 is connected, the load device 30 has a load power requirement, and the new energy power is input, the central controller 5 switches the power control circuit 10 to the first rectification mode.

[0051] In the first rectification mode, the external AC power supply 20 is rectified into DC power by the bidirectional DC / AC power distribution module 1 and then input into the DC bus 31 of the bidirectional DC / DC module 3; the new energy power generated by the new energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3; the DC power and the new energy power are output to the battery system 4 for charging through the bidirectional DC / DC module 3; the external AC power supply 20 supplies power to the load equipment 30 through the AC side.

[0052] like Figure 4As shown, when the central controller 5 detects that the following conditions are met simultaneously: a stable voltage input exists, the battery system 4 is connected and its state of charge is lower than a preset standard value, the external AC power supply 20 is connected, the load device 30 has a clear load power requirement, and the new energy power generation equipment 40 is inputting electrical energy, the central controller 5 will quickly switch the power control circuit 10 to the first rectification mode. In this mode, the power control circuit 10 mainly realizes AC and DC charging, and AC power supplies the load device 30.

[0053] like Figure 3 As shown, in the first rectification mode, the specific energy flow and control logic are as follows:

[0054] Energy flow:

[0055] Battery charging path: External AC power 20 is rectified into DC power by the bidirectional DC / AC power distribution module 1 and then input to the DC bus 31 of the bidirectional DC / DC module 3. Under the control of the central controller 5, the bidirectional DC / AC power distribution module 1 converts AC power into high-quality DC power, providing a foundation for subsequent power distribution and utilization. New energy power generated by the new energy power generation equipment 40 (such as photovoltaic, wind power, etc.) is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3. The maximum power point tracking module 2 can track the maximum power point of the new energy power generation equipment 40 in real time, ensuring that the new energy power is output in the most efficient way. After being connected to the DC bus 31, it participates in subsequent power distribution together with the DC power rectified from AC power. The DC power and new energy power are output to the battery system 4 for charging through the bidirectional DC / DC module 3. The bidirectional DC / DC module 3 converts the power on the DC bus into stable DC power suitable for battery charging according to the needs of the battery system 4, realizing the charging function of the battery system 4.

[0056] Load power supply path: The external AC power supply 20 supplies power to the load device 30 through the AC side to ensure that the load device 30 can work normally.

[0057] Control logic:

[0058] Module direction control: After confirming that the first rectification mode conditions are met, the central controller 5 controls the bidirectional DC / AC power distribution module 1 to be positive, so that it is in rectification mode and converts AC power into DC power; it controls the bidirectional DC / DC module 3 to be in the direction from DC bus 31 to battery system 4, and closes the relevant relays so that electrical energy can flow from DC bus 31 to battery system 4, preparing for battery charging.

[0059] Charging interaction: The battery management system (BMS) of the battery system 4 interacts with the central controller 5 and sends a charging request current according to the current state of charge (SOC) of the battery system 4, so that the external AC power supply 20 (AC IN) input and the maximum power point tracking module 2 can charge the battery at the same time and supply power to the load device 30.

[0060] The central controller 5 ensures that the entire system operates stably and efficiently in the first rectification mode by precisely controlling the working status and parameters of each module.

[0061] In some embodiments, such as Figure 5 and Figure 6 As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is connected and the state of charge is lower than the preset standard value, the external AC power supply 20 is connected, the load device 30 has a load power requirement, and the new energy power is not input, the central controller 5 switches the power control circuit 10 to the second rectification mode.

[0062] In the second rectification mode, the external AC power supply 20 is rectified into DC power by the bidirectional DC / AC power distribution module 1 and then input to the DC bus 31 of the bidirectional DC / DC module 3; the DC power is output to the battery system 4 for charging through the bidirectional DC / DC module 3; the external AC power supply 20 supplies power to the load device 30 through the AC side.

[0063] like Figure 6 As shown, when the central controller 5 detects that the following conditions are met simultaneously: a stable voltage input exists, the battery system 4 is successfully connected and its state of charge is lower than a preset standard value, the external AC power supply 20 is connected, the load device 30 has a clear load power requirement, and there is currently no input of new energy power (i.e., the new energy power generation device 40 is not working or unavailable), the central controller 5 will intelligently switch the power control circuit 10 to the second rectification mode. In this mode, the power control circuit 10 mainly relies on the external AC power supply 20 to charge the battery system 4 and supply power to the load device 30 to cope with the situation where the new energy power generation device 40 is not connected or cannot provide power.

[0064] like Figure 5 As shown, in the second rectification mode, the specific energy flow and control logic are as follows:

[0065] Energy flow:

[0066] Battery charging path: External AC power 20 is rectified into DC power by the bidirectional DC / AC power distribution module 1 and then input to the DC bus 31 of the bidirectional DC / DC module 3. Under the control of the central controller 5, the bidirectional DC / AC power distribution module 1 converts the AC power into high-quality DC power, providing a foundation for subsequent power distribution. The DC power is then output to the battery system 4 through the bidirectional DC / DC module 3 for charging. The bidirectional DC / DC module 3 converts the electrical energy on the DC bus 31 into stable DC power suitable for charging the battery system 4 according to the needs of the battery system 4, thereby achieving the charging function of the battery system 4 and gradually improving the battery's state of charge.

[0067] Load power supply path: The external AC power supply 20 directly supplies power to the load device 30 through the AC side. This power supply method ensures that the load device 30 can obtain stable AC power to meet its normal operating power requirements.

[0068] Control logic:

[0069] Module Direction Control: After confirming that the second rectification mode conditions are met, the central controller 5 controls the bidirectional DC / AC power distribution module 1 to be positive, putting it into rectification mode to convert AC power into DC power. At the same time, it controls the bidirectional DC / DC module 3 to be directed from the DC busbar 31 to the battery system 4, and closes the relevant relays to allow electrical energy to flow from the DC busbar to the battery system 4, preparing for battery charging.

[0070] Charging current interaction: The battery management system (BMS) of battery system 4 interacts with the central controller 5, sending a charging request current based on the current SOC state of battery system 4. The central controller 5 precisely controls the output current of the bidirectional DC / DC module 3 according to the charging request from the BMS, ensuring that battery system 4 can be charged safely and efficiently. In the second rectification mode, since no new energy power is input, there is no situation where the maximum power point tracking module 2 charges battery system 4, but the power control circuit 10 can still charge battery system 4 and supply power to load device 30 through AC input.

[0071] Through the above-mentioned energy flow and control logic, the second rectification mode ensures that, in the absence of new energy power input, the power control circuit 10 can stably charge the battery system 4 and supply power to the load device 30 using the external AC power supply 20, thus ensuring the normal operation of the load device 30 and the effective utilization of energy.

[0072] In some embodiments, such as Figure 7 and Figure 8As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is connected and in a discharging state, the external AC power supply 20 is not connected, the load device 30 has a load power requirement, and the new energy power is not input, the central controller 5 switches the power control circuit 10 to inverter mode.

[0073] In inverter mode, the battery system 4 outputs battery DC power to the bidirectional DC / AC power distribution module 1 through the bidirectional DC / DC module 3; the bidirectional DC / AC power distribution module 1 inverts the battery DC power into AC power and supplies the AC power to the load device 30 through the AC side.

[0074] like Figure 8 As shown, when the central controller 5 detects that the following conditions are met simultaneously: there is a voltage input state, the battery system 4 is connected and currently in a discharging state, the external AC power supply 20 is not connected (i.e., the external AC power supply 20 is unavailable or not connected), the load device 30 has a clear load power demand, and there is no input of renewable energy (i.e., the renewable energy generation equipment 40 is not working or there is currently no renewable energy available), the central controller 5 will intelligently switch the power control circuit 10 to inverter mode. In this mode, it is ensured that the battery system 4 can independently power the load device 30 even without the external AC power supply 20.

[0075] like Figure 7 As shown, in inverter mode, the specific energy flow and control logic are as follows:

[0076] Energy Flow: Battery system 4 outputs DC power from the battery to bidirectional DC / AC distribution module 1 via bidirectional DC / DC module 3. Under the control of central controller 5, bidirectional DC / DC module 3 appropriately regulates the voltage and current of the DC power output from battery system 4 to meet the input requirements of bidirectional DC / AC distribution module 1, ensuring stable and efficient power transmission. Bidirectional DC / AC distribution module 1 inverts the battery DC power into AC power and supplies AC power to load device 30 via the AC side. As the core component of the inverter, bidirectional DC / AC distribution module 1 converts DC power into AC power that meets the requirements of load device 30, providing stable power support for load device 30.

[0077] Control logic:

[0078] Module Direction Control: After confirming that the inverter mode conditions are met, the central controller 5 controls the bidirectional DC / AC power distribution module 1 to operate in the inverter direction. This control operation switches the bidirectional DC / AC power distribution module 1 from rectification mode to inverter mode, preparing it for subsequent power conversion.

[0079] Discharge Interaction: The central controller 5 interacts with the battery management system (BMS) of the battery system 4. After confirming that the back-end load device 30 requires power, the central controller 5 sends a discharge request current to the battery BMS via the CAN channel. The battery BMS responds to the discharge request from the central controller 5 and, based on the battery's current state (such as SOC, health status, etc.) and the discharge request, controls the battery system 4 to perform a discharge operation, thereby supplying power to the load device 30.

[0080] Through the above-mentioned energy flow and control logic, the inverter mode ensures that when neither the external AC power source 20 nor the new energy power generation equipment 40 can provide power, the power control circuit 10 can stably supply power to the load equipment 30 using the power stored in the battery system 4, thus ensuring the normal operation of the load equipment 30 under special circumstances and improving the reliability of the power control circuit 10 and its energy self-sufficiency.

[0081] In some embodiments, such as Figure 9 and Figure 10 As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is connected and in a charging state, the external AC power supply 20 is not connected, the load device 30 has a load power requirement, and the new energy power is input and the output power of the maximum power point tracking module 2 is greater than the load power requirement, the central controller 5 switches the power control circuit 10 to the first new energy power supply mode.

[0082] In the first new energy power supply mode, the new energy power generated by the new energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3; wherein, the first part of the new energy power is output to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3, the bidirectional DC / AC distribution module 1 inverts it into AC power, and supplies power to the load equipment 30 through the AC side; the second part of the new energy power is output to the battery system 4 for charging through the bidirectional DC / DC module 3.

[0083] like Figure 10 As shown, when the central controller 5 detects that the following conditions are met simultaneously: a stable voltage input state exists, the battery system 4 is connected and currently charging, the external AC power supply 20 is not connected (i.e., the external AC power supply 20 is unavailable or not connected), the load device 30 has a clear load power demand, and new energy power is input and the output power of the maximum power point tracking module 2 is greater than the load power demand, the central controller 5 will intelligently switch the power control circuit 10 to the first new energy power supply mode. This mode is suitable for situations where the new energy power generation equipment 40 (such as photovoltaic, wind power, etc.) has a strong power generation capacity and can simultaneously meet the power demand of the load device 30 and the charging demand of the battery system 4, making full use of new energy power and improving energy utilization efficiency.

[0084] like Figure 9 As shown, under the first new energy power supply mode, the specific energy flow and control logic are as follows:

[0085] Energy flow:

[0086] The renewable energy generated by the renewable energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3. The maximum power point tracking module 2 can track the maximum power point of the renewable energy power generation equipment 40 in real time, ensuring that the renewable energy is output as high-quality DC power in the most efficient way, providing a stable and reliable energy foundation for subsequent power distribution.

[0087] Load power supply path: The first part of the new energy power is output to the bidirectional DC / DC module 1 through the bidirectional DC / AC distribution module 3. The bidirectional DC / AC distribution module 1 inverts it into AC power and supplies power to the load device 30 through the AC side. Under the control of the central controller 5, the bidirectional DC / AC distribution module 1 converts DC power into AC power that meets the usage requirements of the load device 30, ensuring that the load device 30 can obtain stable power support.

[0088] Battery charging path: The second part of the new energy power is output to the battery system 4 through the bidirectional DC / DC module 3 for charging. The bidirectional DC / DC module 3 converts the power on the DC bus into a stable DC power suitable for battery charging according to the needs of the battery system 4, thereby realizing the charging function of the battery system 4 and gradually improving the battery's state of charge.

[0089] Control logic:

[0090] Module direction control: After confirming that the conditions of the first new energy power supply mode are met, the central controller 5 controls the running direction of the bidirectional DC / AC power distribution module 1 to the inverter direction, so that the bidirectional DC / AC power distribution module 1 can convert DC power into AC power to supply power to the load equipment 30; at the same time, the direction of the bidirectional DC / DC module 3 is changed to the charging direction of the battery, in preparation for charging the battery system 4.

[0091] Charging Interaction: The central controller 5 interacts with the battery management system (BMS) of the battery system 4. The central controller 5 confirms the battery charging current (if the power generation from the renewable energy source cannot reach the current required for a full charge, it sets the maximum achievable current), and then sends a charging request current to the battery BMS via the CAN channel. The battery BMS responds to the charging request from the central controller 5 and, based on the battery's current state (such as SOC, health status, etc.) and the charging request current, controls the battery system 4 to perform the charging operation. At this time, the load device 30 obtains electrical energy to operate normally, and the battery system 4 is also in a charging state, realizing the efficient utilization of renewable energy.

[0092] Through the above-mentioned energy flow and control logic, the first new energy power supply mode ensures that when the new energy power generation equipment 40 has a strong power generation capacity, the power control circuit 10 can prioritize meeting the power demand of the load equipment 30 and use the excess power to charge the battery system 4, making full use of new energy power, improving energy utilization efficiency, and ensuring the stable operation of the power control circuit 10.

[0093] In some embodiments, such as Figure 10 and Figure 11 As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is connected and in a discharging state, the external AC power supply 20 is not connected, the load device 30 has a load power demand, and the new energy power is input and the output power of the maximum power point tracking module 2 is less than the load power demand, the central controller 5 switches the power control circuit 10 to the second new energy power supply mode.

[0094] In the second new energy power supply mode, the new energy power generated by the new energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3; the new energy power is output to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3; the battery system 4 outputs battery DC power to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3; the bidirectional DC / AC distribution module 1 inverts the new energy power and battery DC power into AC power, and supplies the load equipment 30 with AC power through the AC side.

[0095] like Figure 10As shown, when the central controller 5 detects that the following conditions are met simultaneously: a stable voltage input state exists, the battery system 4 is connected and currently in a discharging state, the external AC power supply 20 is not connected (i.e., the external AC power supply 20 is unavailable or not connected), the load device 30 has a clear load power demand, and new energy power is input but the output power of the maximum power point tracking module 2 is less than the load power demand, the central controller 5 will intelligently and quickly switch the power control circuit 10 to the second new energy power supply mode. This mode is suitable for situations where the power generation capacity of the new energy power generation equipment 40 (such as photovoltaic, wind power, etc.) is limited and cannot meet the power demand of the load device 30 alone, requiring the battery system 4 to cooperate in discharging to jointly supply power to the load device 30, ensuring that the load device 30 can still work normally when new energy power generation is insufficient.

[0096] like Figure 11 As shown, under the second new energy power supply mode, the specific energy flow and control logic are as follows:

[0097] Energy Flow: The renewable energy generated by the renewable energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then fed into the DC bus 31 of the bidirectional DC / DC module 3. The maximum power point tracking module 2 can track the maximum power point of the renewable energy power generation equipment in real time, ensuring that the renewable energy is output as high-quality DC power in the most efficient way, providing a basis for subsequent power distribution. The battery system 4 outputs battery DC power to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3. Under the control of the central controller 5, the bidirectional DC / DC module 3 appropriately regulates the voltage and current of the DC power output from the battery system 4 to meet the requirements of merging with the renewable energy before inputting into the bidirectional DC / AC distribution module 1. The renewable energy and battery DC power are jointly output to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3. The bidirectional DC / AC distribution module 1 inverts the renewable energy and battery DC power into AC power and supplies the AC power to the load equipment 30 through the AC side. The bidirectional DC / AC power distribution module 1 combines two different sources of DC power and then inverts them to output AC power that meets the requirements of the load device 30, ensuring that the load device 30 can obtain stable power support.

[0098] Control logic:

[0099] Module direction control: After confirming that the conditions of the second new energy power supply mode are met, the central controller 5 controls the running direction of the bidirectional DC / AC power distribution module 1 to the inverter direction, so that the bidirectional DC / AC power distribution module 1 can convert DC power into AC power to supply power to the load equipment 30; at the same time, the direction of the bidirectional DC / DC module 3 is changed to the battery discharge direction to prepare for the discharge of the battery system 4.

[0100] Discharge Interaction: The central controller 5 interacts with the battery management system (BMS) of the battery system 4. The central controller 5 confirms that the backend load device 30 requires power, and then sends a discharge request current to the battery BMS via the CAN channel. The battery BMS responds to the discharge request from the central controller 5 and controls the battery system 4 to perform the discharge operation based on the battery's current state (such as SOC, health status, etc.) and the discharge request current. At this time, the new energy power and the DC power from the battery discharge are inverted through the bidirectional DC / AC power distribution module 1 to power the load device 30, ensuring that the load device 30 is powered and operates normally.

[0101] Through the above-mentioned energy flow and control logic, the second new energy power supply mode ensures that when the power generation capacity of the new energy power generation equipment 40 is limited, the power control circuit 10 can stably supply power to the load equipment 30 through the synergistic effect of the new energy power and the discharge of the battery system 4, thus ensuring the normal operation of the load equipment 30 when the new energy power generation is insufficient, and improving the reliability of the power control circuit 10 and the comprehensive energy utilization efficiency.

[0102] In some embodiments, such as Figure 12 and Figure 13 As shown, when the central controller 5 detects that there is a voltage input state, the battery system 4 is not connected, the external AC power supply 20 is not connected, the load device 30 has a load power requirement, and the new energy power is input, the central controller 5 switches the power control circuit 10 to the third new energy power supply mode.

[0103] In the third new energy power supply mode, the new energy power generated by the new energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then connected to the DC bus 31 of the bidirectional DC / DC module 3; the new energy power is output to the bidirectional DC / AC power distribution module 1 through the bidirectional DC / DC module 3; the bidirectional DC / AC power distribution module 1 inverts the new energy power into AC power and supplies the AC power to the load equipment 30 through the AC side.

[0104] like Figure 13 As shown, when the central controller 5 detects that the following conditions are met simultaneously: there is a voltage input state (but the battery system 4 is not connected at this time), the external AC power supply 20 is not connected (i.e., the external AC power supply 20 is unavailable or not connected), the load device 30 has a clear load power demand, and new energy power is input, the central controller 5 will intelligently switch the power control circuit 10 to the third new energy power supply mode, that is, the low-energy consumption mode. This mode is suitable for situations where only the new energy power generation equipment 40 (such as photovoltaic, wind power, etc.) is connected, and the load device 30 has a power demand. It aims to make full use of new energy power to supply power to the load device 30 in a low-energy manner, reducing dependence on other energy forms.

[0105] like Figure 12 As shown, under the third new energy power supply mode, the specific energy flow and control logic are as follows:

[0106] Energy Flow: The renewable energy generated by the renewable energy power generation equipment 40 is processed by the maximum power point tracking module 2 and then fed into the DC bus 31 of the bidirectional DC / DC module 3. The maximum power point tracking module 2 can track the maximum power point of the renewable energy power generation equipment 40 in real time, ensuring that the renewable energy is output as stable DC power in the most efficient way, providing a foundation for subsequent power conversion. The renewable energy is output to the bidirectional DC / AC distribution module 1 through the bidirectional DC / DC module 3. In this mode, the bidirectional DC / DC module 3 mainly plays the role of power transmission and voltage adaptation, appropriately regulating the voltage of the DC power output from the maximum power point tracking module 2 to meet the input requirements of the bidirectional DC / AC distribution module 1. The bidirectional DC / AC distribution module 1 inverts the renewable energy into AC power and supplies the AC power to the load equipment 30 through the AC side. Under the control of the central controller 5, the bidirectional DC / AC distribution module 1 converts the DC power into AC power that meets the requirements of the load equipment 30, ensuring that the load equipment 30 can obtain stable power support.

[0107] Control logic:

[0108] Module Direction Control: After confirming that the conditions for the third new energy power supply mode are met, the central controller 5 controls the bidirectional DC / AC power distribution module 1 to switch to the inverter direction. This control operation enables the bidirectional DC / AC power distribution module 1 to convert DC power to AC power, preparing to supply power to the load equipment 30.

[0109] Power supply implementation: The renewable energy generated by the photovoltaic / wind power generation equipment 40 is directly supplied to the load equipment 30 through the coordinated operation of the maximum power point tracking module 2 and the bidirectional DC / AC power distribution module 1. The central controller 5 does not need to interact with the battery system 4; it only needs to ensure the normal operation of the maximum power point tracking module 2 and the bidirectional DC / AC power distribution module 1 to achieve a stable power supply of renewable energy to the load equipment.

[0110] Through the above-mentioned energy flow and control logic, the third new energy power supply mode ensures that when only the new energy power generation equipment 40 is connected, the power control circuit 10 can make full use of the new energy power in a low-energy-consumption manner, stably supply power to the load equipment 30, improve energy utilization efficiency, reduce dependence on other energy forms, and is suitable for application scenarios with special energy supply requirements or in energy-constrained environments.

[0111] In some embodiments, under any of the inverter mode, the first new energy power supply mode, and the third new energy power supply mode, the bidirectional DC / AC power distribution module 1 is also used to connect the AC power generated after inverter to the main power grid according to the grid connection command.

[0112] In any of the inverter mode, the first new energy power supply mode, and the third new energy power supply mode, the bidirectional DC / AC power distribution module 1 not only undertakes the core function of powering the load equipment 30, but also has the important function of connecting the AC power generated after inverter to the main power grid according to the grid connection command.

[0113] The main function of grid connection is to integrate excess electrical energy into the main power grid. In practical applications, when the electrical energy generated by new energy power generation equipment 40 (such as photovoltaic, wind power, etc.) exceeds the current demand of the load equipment 30, this excess, temporarily unused electrical energy can be sold in conjunction with the national power grid through grid connection, thereby achieving rational use of energy and improving economic benefits.

[0114] When the bidirectional DC / AC power distribution module 1 is in at least one of the inverter mode, the first new energy power supply mode, and the third new energy power supply mode, the grid connection function is activated. In all three modes, the process of converting DC power into AC power is involved, providing the necessary electrical energy form basis for grid connection operation.

[0115] Users can choose whether to connect their electricity to the main grid based on actual needs and grid policies. They can also prioritize grid connection over supplying the load. For example, if a user wants to sell excess electricity to the grid for economic gain, they can choose to prioritize grid connection; conversely, if the load equipment's power demand is urgent or critical, they can choose to prioritize supplying the load to ensure its normal operation.

[0116] After the user selects grid connection and issues a grid connection command, the bidirectional DC / AC distribution module 1 will connect the inverter-generated AC power that conforms to the main grid standards into the main grid according to the command requirements. During this process, the bidirectional DC / AC distribution module 1 needs to communicate and coordinate with the main grid to ensure that the power quality, voltage, frequency and other parameters of the grid connection meet the grid requirements, so as to ensure the stable operation of the grid.

[0117] Through the implementation of the above-mentioned grid connection function, the power control circuit 10 can more flexibly respond to energy supply and demand under different power supply modes, realize the optimal allocation of energy and maximize economic benefits, and at the same time conform to the national policy orientation for grid connection of new energy power generation, which helps to promote the development and application of the new energy industry.

[0118] The power control circuit 10 of this application provides an innovative solution to address the limitations of existing circuit system designs, especially in space-constrained environments such as ships. Traditional designs typically lack flexibility and scalability, are difficult to adjust once the power is set, and have limited energy access methods. In contrast, the embodiment of this application significantly improves the redundancy and fault tolerance of the device by implementing parallel input and output, thereby enhancing the reliability and adaptability of the circuit system.

[0119] Furthermore, this embodiment avoids the use of an integrated energy storage converter (PCS), which not only simplifies the circuit system structure and reduces costs but also reduces the complexity of the circuit system. This design choice makes the power control circuit 10 more economical and efficient, while also facilitating maintenance and upgrades.

[0120] Regarding communication protocols, the central controller 5 uses the CAN 2.0B protocol for inter-module communication control. Although the CAN 2.0B protocol can be replaced by other protocols such as RS485, CANopen, and RS232, CAN 2.0B stands out due to its simple bus wiring method and strong anti-interference capabilities, making it particularly suitable for use in environments with multiple devices and limited space, such as ships. This protocol choice improves the user experience and ensures the stable operation of the circuit system in complex electromagnetic environments.

[0121] This application also designs the circuit scale as a microgrid, specifically addressing the daily energy storage and distribution needs on board, in contrast to traditional macro-energy solutions such as large wind turbines and large photovoltaic arrays. This microgrid design makes the power control circuit 10 more suitable for specific application scenarios such as ships, effectively solving energy management and distribution problems on board.

[0122] The power control circuit 10 of this application is mainly used in shipboard energy storage microgrids. It employs a scheme combining multiple converters with energy storage batteries to achieve multi-energy access and efficient storage utilization. The power control circuit 10 can not only perform AC-DC conversion but also realize AC uninterruptible power supply (UPS) distribution, ensuring continuous power supply to critical loads. Furthermore, the power control circuit 10 also has the function of selectively protecting critical loads, further improving the safety and reliability of the circuit system.

[0123] The multi-module integrated circuit power circuit design of the power control circuit 10 in this application includes the energy flow distribution under multi-mode operation, as well as the design of each module, such as the automatic switching input source and selective protection design of the bidirectional DC / AC power distribution module 1, and the multi-energy access of the maximum power point tracking module 2, which together constitute an efficient, flexible and reliable power management system, which is particularly suitable for application in special environments such as ships.

[0124] All of the above technical solutions can be combined in any way to form optional embodiments of this application, and will not be described in detail here.

[0125] The power control circuit 10 provided in this embodiment includes a bidirectional DC / AC power distribution module 1, a maximum power point tracking module 2, a bidirectional DC / DC module 3, a battery system 4, and a central controller 5. The bidirectional DC / AC power distribution module 1 and the maximum power point tracking module 2 are connected in parallel to the DC bus 31 of the bidirectional DC / DC module 3, and the battery system 4 is also connected in parallel to the DC bus 31 of the bidirectional DC / DC module 3. The bidirectional DC / AC power distribution module 1 has its DC side connected to the DC bus 31, and its AC side is used to connect to an external AC power source 20 or a load device 30, realizing bidirectional conversion between AC and DC power. The power point tracking module 2 is used to access the new energy generated by the new energy power generation equipment 40, and to charge the battery system 4 or supply power to the bidirectional DC / DC distribution module 1 connected to the DC bus 31 through the bidirectional DC / DC module 3; the bidirectional DC / DC module 3 is used to realize the charging and discharging function of the battery system 4, and to perform power conversion with the bidirectional DC / AC distribution module 1 and / or the maximum power point tracking module 2; the battery system 4 is used to store and release electrical energy; the central controller 5 communicates and controls the battery system 4 and each module through a communication bus to realize the switching of different working modes in the multi-modal working mode. The power control circuit 10 provided in this application embodiment, by integrating the bidirectional DC / AC distribution module 1, the maximum power point tracking module 2, the bidirectional DC / DC module 3, the battery system 4 and the central controller 5, constructs an efficient and flexible multi-energy bidirectional utilization system, which can integrate multiple new energy power generation equipment 40, improve the conversion efficiency of new energy, and change the energy flow of each module through the central controller 5 to realize the switching of multi-modal working modes to meet the diverse needs in different environments.

[0126] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0127] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0128] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electrical energy control circuit, characterized in that, It includes a bidirectional DC / AC power distribution module, a maximum power point tracking module, a bidirectional DC / DC module, a battery system, and a central controller; the bidirectional DC / AC power distribution module and the maximum power point tracking module are connected in parallel to the DC bus of the bidirectional DC / DC module, and the battery system is connected in parallel to the DC bus of the bidirectional DC / DC module; The bidirectional DC / AC power distribution module has its DC side connected to the DC busbar and its AC side used to connect to an external AC power source or load device, realizing bidirectional conversion between AC and DC power. The maximum power point tracking module is used to access the new energy power generated by the new energy power generation equipment, and to charge the battery system or supply power to the bidirectional DC / DC power distribution module connected to the DC bus through the bidirectional DC / AC power distribution module. The bidirectional DC / DC module is used to realize the charging and discharging function of the battery system, and to perform power conversion with the bidirectional DC / AC power distribution module and / or the maximum power point tracking module; The battery system is used to store and release electrical energy; The central controller communicates and controls the battery system and various modules via a communication bus to achieve switching between different operating modes in the multi-modal operating mode.

2. The power control circuit as described in claim 1, characterized in that, The central controller is used to automatically switch to the corresponding working mode in the multi-modal working mode by monitoring the voltage input status, the connection status of the battery system, the connection status of the external AC power supply, the load demand power of the load device, and the input status of the new energy power in real time.

3. The power control circuit as described in claim 2, characterized in that, The multimodal operating modes include a first rectification mode, a second rectification mode, an inverter mode, a first new energy power supply mode, a second new energy power supply mode, and a third new energy power supply mode.

4. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is connected and the state of charge is lower than the preset standard value, the external AC power supply is connected, the load device has a load power requirement, and the new energy power is input, the central controller switches the power control circuit to the first rectification mode. In the first rectification mode, the external AC power supply is rectified into DC power by the bidirectional DC / AC power distribution module and then input into the DC bus of the bidirectional DC / DC module; the new energy power generated by the new energy power generation equipment is processed by the maximum power point tracking module and then connected to the DC bus of the bidirectional DC / DC module; the DC power and the new energy power are output to the battery system for charging through the bidirectional DC / DC module; the external AC power supply supplies power to the load equipment through the AC side.

5. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is connected and the state of charge is lower than the preset standard value, the external AC power supply is connected, the load device has a load power requirement, and the new energy power is not input, the central controller switches the power control circuit to the second rectification mode. In the second rectification mode, the external AC power supply is rectified into DC power by the bidirectional DC / AC power distribution module and then input to the DC bus of the bidirectional DC / DC module; the DC power supply is output to the battery system for charging through the bidirectional DC / DC module; the external AC power supply supplies power to the load device through the AC side.

6. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is connected and in a discharging state, the external AC power supply is not connected, the load device has a load power requirement, and the new energy power is not input, the central controller switches the power control circuit to the inverter mode. In the inverter mode, the battery system outputs DC power from the battery to the bidirectional DC / AC power distribution module through the bidirectional DC / DC module; the bidirectional DC / AC power distribution module inverts the DC power from the battery into AC power, and supplies the load device with the AC power through the AC side.

7. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is connected and charging, the external AC power supply is not connected, the load device has a load power requirement, and the new energy power is input and the output power of the maximum power point tracking module is greater than the load power requirement, the central controller switches the power control circuit to the first new energy power supply mode. In the first new energy power supply mode, the new energy power generated by the new energy power generation equipment is processed by the maximum power point tracking module and then connected to the DC bus of the bidirectional DC / DC module; wherein, a first part of the new energy power is output to the bidirectional DC / AC distribution module through the bidirectional DC / DC module, the bidirectional DC / AC distribution module inverts it into AC power, and supplies power to the load equipment through the AC side; a second part of the new energy power is output to the battery system for charging through the bidirectional DC / DC module.

8. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is connected and in a discharging state, the external AC power supply is not connected, the load device has a load power requirement, and the new energy power is input and the output power of the maximum power point tracking module is less than the load power requirement, the central controller switches the power control circuit to the second new energy power supply mode. In the second new energy power supply mode, the new energy power generated by the new energy power generation equipment is processed by the maximum power point tracking module and then connected to the DC bus of the bidirectional DC / DC module; the new energy power is output to the bidirectional DC / AC distribution module through the bidirectional DC / DC module; the battery system outputs battery DC power to the bidirectional DC / AC distribution module through the bidirectional DC / DC module; the bidirectional DC / AC distribution module inverts the new energy power and the battery DC power into AC power, and supplies the load equipment with the AC power through the AC side.

9. The power control circuit as described in claim 3, characterized in that, When the central controller detects that there is a voltage input state, the battery system is not connected, the external AC power supply is not connected, the load device has a load power requirement, and the new energy power is input, the central controller will switch the power control circuit to the third new energy power supply mode. In the third new energy power supply mode, the new energy power generated by the new energy power generation equipment is processed by the maximum power point tracking module and then connected to the DC bus of the bidirectional DC / DC module; the new energy power is output to the bidirectional DC / AC distribution module through the bidirectional DC / DC module; the bidirectional DC / AC distribution module inverts the new energy power into AC power and supplies the load equipment with the AC power through the AC side.

10. The power control circuit as described in claim 3, characterized in that, In any of the inverter mode, the first new energy power supply mode, and the third new energy power supply mode, the bidirectional DC / AC power distribution module is also used to connect the AC power generated after inverter to the main power grid according to the grid connection command.

11. The power control circuit as described in claim 1, characterized in that, The new energy power generation equipment includes at least one of photovoltaic power generation equipment, wind power generation equipment, hydropower generation equipment, wave power generation equipment, tidal power generation equipment, and biomass power generation equipment.

12. The power control circuit as described in claim 1, characterized in that, The load equipment includes at least one of the following: ship power system, marine engineering equipment, and offshore operation equipment.

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