Semi-submersible offshore platform wind, solar, water storage multi-energy complementary power supply system and operation method

Abstract

The present invention provides a wind, solar, and water storage multi-energy complementary power supply system and operation method for a semi-submersible marine platform. By integrating the multi-energy complementarity of multiple renewable energy sources, coupling a wave energy power generation system, a wind energy power generation system, and a solar photovoltaic power generation system, the marine energy is fully and efficiently utilized in a limited space; the bus voltage is reasonably configured, the number of conversions and efficiency of electric energy in the system are controlled, and the system loss is reduced under the premise of meeting the power supply demand of the system, and the function of transmitting power from AC to DC or DC to AC on a semi-submersible marine platform is realized. The present invention uses an energy storage system to store and recover the excess load power generated by the wave energy power generation system, the combined vertical axis wind turbine power generation system, and the flexible solar photovoltaic power generation system, and realizes the storage management of electric energy with a capacity of more than 100KW·h; through the new energy power generation technology, multiple renewable energy sources at sea are integrated and utilized, the resource utilization rate is improved, and the reliability of power supply is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of smart grids, and in particular relates to a wind, solar, and water storage multi-energy complementary power supply system and an operation method for a semi-submersible ocean platform. Background Art

[0002] As the scale of marine development and construction continues to expand, the electricity load of offshore platforms is gradually increasing, and the method of using gas power supply alone will be difficult to meet the electricity demand.

[0003] Unlike onshore structures and environments, offshore semi-submersible platforms are typically isolated island systems. Connecting them to the grid and utilizing energy sources can save fuel and reduce operating costs. However, the inherent randomness and volatility of the load power of offshore semi-submersible platforms make the introduction of alternative energy sources challenging to control. Furthermore, a single energy source can suffer from drawbacks such as insufficient conversion efficiency, unstable power output, and low utilization. For large offshore structures, abundant reserves of renewable energy sources such as wind, solar, and wave power are available. Wind and solar are the two most representative renewable energy sources. Faced with an energy crisis, countries are actively promoting the use of wind turbines and photovoltaic generators to convert wind and solar energy into electricity. With the rapid advancement of science and technology, wind power generation technology has been able to maximize wind energy capture by adjusting the pitch and power speed of the generator set. The photovoltaic industry has also achieved mass production and deployment of third-generation perovskite solar panels, significantly reducing costs while increasing power generation and quality. Wave energy is one of the main forms of ocean energy. In the deep ocean far away from the coastline, waves can generate enormous energy. If the kinetic energy of waves and other water waves can be converted into mechanical energy to drive the rotation of impellers, and then converted into other energy sources such as electricity, it can effectively alleviate the energy shortage problem and reduce environmental pollution during ultra-long-distance energy transmission. It is a good technical route.

[0004] Making full use of abandoned wind and solar power at sea and waves, combined with new energy power generation technologies, is of great significance to protecting the marine ecological environment, reducing the operating costs of marine platforms, and promoting the sustainable development of my country's environment.

[0005] On the other hand, AC / DC hybrid microgrids are a crucial component of future smart grids. Various distributed power sources, energy storage devices, and loads are flexibly allocated to the AC / DC microgrid based on their respective output characteristics. A multi-energy complementary microgrid integrates multiple energy sources through the power grid. Currently, traditional electricity / heat / cooling load distribution methods cannot achieve efficient and clean energy utilization. Therefore, consideration is being given to combining electricity / heat / cooling multi-energy complementary technologies with the rational allocation of various energy supply devices. A multi-energy complementary microgrid power generation system goes beyond simply combining solar, wind, gas or oil generators, and hydroelectric generators into a single microgrid for power generation. It integrates multiple energy sources to overcome the limitations of a single energy source on a semi-submersible offshore platform. This maximizes the use of renewable energy while increasing power generation and stabilizing power generation.

[0006] Traditional power transmission causes excessive energy supply losses for near- and far-sea semi-submersible platforms, which has an impact on the environment; the power grid of semi-submersible offshore platforms does not make sufficient use of offshore energy, resulting in low utilization efficiency and single energy source utilization; the single clean energy structure of offshore platforms has disadvantages such as insufficient conversion efficiency and unstable power output.

[0007] Based on the above requirements, it is necessary to realize AC to DC conversion and power transmission, or DC to AC power transmission on a semi-submersible offshore platform, and to perform reliable operation control. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a wind, solar, and water storage multi-energy complementary power supply system and operation method for a semi-submersible marine platform, which is used to realize the function of converting AC to DC and transmitting power or DC to AC on the semi-submersible marine platform.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: a semi-submersible marine platform wind, solar, water and storage multi-energy complementary power supply system, including a power generation device, an inverter, an integrated control box, an energy storage module and a load module; the power generation device includes a wave energy power generation device, a flexible solar photovoltaic power generation device, and a combined vertical axis wind turbine power generation device; the inverter includes a first AC / DC inverter, a first DC / DC inverter, a second AC / DC inverter, a second DC / DC inverter, a third DC / DC inverter, and a DC / AC inverter;

[0010] The wave energy power generation device is connected to the first AC / DC inverter and the first DC / DC inverter in sequence; the combined vertical axis wind turbine power generation device is connected to the second AC / DC inverter and the second DC / DC inverter in sequence; the flexible solar photovoltaic power generation device is connected to the third DC / DC inverter; the output ends of the first DC / DC inverter, the second DC / DC inverter and the third DC / DC inverter are connected in parallel to the integrated control box; the integrated control box is connected to the energy storage module and the load module respectively; the AC / DC inverter, the DC / DC inverter and the three-phase rectifier inside the integrated control box are used to stabilize, regulate and perform constant current processing on the output voltage of the wave energy power generation device, the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device; the integrated control box is also used to output the processed voltage to charge the energy storage module, or to invert the output voltage of the wave energy power generation device, the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device to power the load module;

[0011] The energy storage module is connected to the load module through a DC / AC inverter, which is used to convert direct current into alternating current that meets grid-connected requirements through a DC / AC inverter and phase-locked frequency conversion. After being connected to an electric energy meter to measure the power, the module transmits power to the load module for grid-connected connection.

[0012] According to the above scheme, it also includes relay switches; the relay switches include a first relay switch, a second relay switch, a third relay switch and a fourth relay switch; the wave energy power generation device is connected to the first AC / DC inverter through the first relay switch; the combined vertical axis wind turbine power generation device is connected to the second AC / DC inverter through the second relay switch; the flexible solar photovoltaic power generation device is connected to the third DC / DC inverter through the third relay switch; and the integrated control box is connected to the energy storage module through the fourth relay switch;

[0013] The relay switch is used to receive feedback from the integrated control box when the amount of electricity generated by the power generation device exceeds the threshold of the relay coil, temporarily interrupting or slowing down the operation of part of the power generation device.

[0014] According to the above scheme, the wave energy power generation device uses multiple liftable array oscillating float power generation devices arranged around a semi-submersible marine platform; each liftable array oscillating float power generation device is equipped with multiple energy-harvesting floats; the energy-harvesting floats are used to utilize the semi-submersible marine platform to absorb energy at multiple points and transmit mechanical energy to a coaxial generator for power generation.

[0015] According to the above scheme, the combined vertical axis wind turbine power generation device adopts multiple wind turbines arranged axially symmetrically on the top of the semi-submersible marine platform; the S-type vertical axis wind turbine in the upper half of the combined wind turbine is used to provide starting torque, and the H-type vertical axis wind turbine in the lower half is used to generate electricity efficiently, so that wind in any direction drives the blades to rotate; the combined vertical axis wind turbine power generation device relies on the rotation of the wind wheel with a battery to transmit the captured wind energy, smooth out unstable wind energy in complex situations, and stabilize the circuit within the system.

[0016] According to the above scheme, the flexible solar photovoltaic power generation device uses bendable photosynthetic silicon single crystal semi-flexible solar panels, which are arranged on the surface of a semi-submersible ocean platform to reduce obstructions, collect solar energy over the largest area, and improve the energy utilization efficiency of photovoltaic power generation.

[0017] According to the above solution, the integrated control box uses a chip processor with an integrated management system to collect, process, and analyze external and internal information, coordinate and control the power supply within the system, maximize energy utilization efficiency, avoid frequent charging and discharging of the energy storage module and over-discharge conditions, extend the service life of the energy storage module, and improve the economic efficiency of the system. The charge and discharge control module is used to cope with power load fluctuations and maintain system stability, keeping the DC bus output voltage deviation below ±10%, and ensuring energy balance between the power generation device, energy storage module, and load module, and output voltage and frequency stability.

[0018] External information includes meteorological information and water resource information; internal information includes load power consumption information, energy storage module power information, inverter electrical information and relay opening and closing information;

[0019] The load module is the life operation system of the semi-submersible marine platform, which is used to receive the power distributed by the integrated control box and transmit it to various construction operation structures and life circuits;

[0020] It also includes a bidirectional inverter for connecting the integrated control box and load modules;

[0021] It also includes a display screen connected to the integrated control box for operators to observe power generation energy data in real time.

[0022] According to the above scheme, a BMS intelligent battery management module is also included. The BMS intelligent battery management module is respectively connected to the charge and discharge control module and the energy storage module of the integrated control box. The BMS intelligent battery management module includes a charge and discharge protection module, a balancing control module, a current detection module, a capacity control module, and a real-time data management module;

[0023] The charge and discharge protection module is used to control the charge and discharge mode of the energy storage module using the energy storage terminal voltage as a reference parameter, and to manage and protect the charge and discharge of the energy storage module. The charge and discharge modes of the energy storage module include charge mode, idle mode, and discharge mode.

[0024] The balancing control module is used to set the input overvoltage protection upper limit to prevent the energy storage module from overcharging;

[0025] The current detection module is used to activate the unloading circuit current limiting protection when the charging current of the energy storage module is too large;

[0026] The capacity control module is used to stop charging the energy storage module according to the received feedback signal when the power of the energy storage module reaches the set upper limit;

[0027] The real-time data management module is used to monitor the status of the energy storage module in real time, adjust the charging voltage and current in real time, convert electricity to the load through the inverter when the semi-submersible offshore platform needs to start the operating system, and detect the battery terminal voltage and current to determine whether to activate the power-off protection to prevent deep discharge of the energy storage module;

[0028] The BMS intelligent battery management module is also used for electrical equipment control, data information collection and processing, voltage and current monitoring feedback, fault warning, database management and human-computer interaction to maintain the stable operation of the microgrid, improve the power utilization efficiency of the power supply in the microgrid, and ensure the quality of the power output of the microgrid.

[0029] According to the above solution, the energy storage module includes grouped batteries; the batteries use 48V 200Ah lithium batteries; the batteries are used to power AC loads through inversion or directly power DC loads, and also achieve the purpose of energy buffering by storing the electricity generated by the power generation device. When the offshore energy is insufficient and the battery power is sufficient, the excess energy is provided to the load or transmitted to the power grid.

[0030] The operating method of the wind, solar, water and storage multi-energy complementary power supply system based on a semi-submersible marine platform includes the following steps:

[0031] S0: Build a wind, solar, water and storage multi-energy complementary power supply system for a semi-submersible marine platform; including a power generation device, an inverter, an integrated control box, an energy storage module and a load module; the power generation device includes a wave energy power generation device, a flexible solar photovoltaic power generation device, and a combined vertical axis wind turbine power generation device; the inverter includes a first AC / DC inverter, a first DC / DC inverter, a second AC / DC inverter, a second DC / DC inverter, a third DC / DC inverter, and a DC / AC inverter;

[0032] The wave energy power generation device is sequentially connected to the first AC / DC inverter and the first DC / DC inverter; the combined vertical axis wind turbine power generation device is sequentially connected to the second AC / DC inverter and the second DC / DC inverter; the flexible solar photovoltaic power generation device is connected to the third DC / DC inverter; the output ends of the first DC / DC inverter, the second DC / DC inverter, and the third DC / DC inverter are connected in parallel to the integrated control box; the integrated control box is respectively connected to the energy storage module and the load module; the energy storage module is connected to the load module through the DC / AC inverter;

[0033] Also includes a relay switch; the relay switch includes a first relay switch, a second relay switch, a third relay switch and a fourth relay switch;

[0034] The wave energy power generation device is connected to the first AC / DC inverter via a first relay switch; the combined vertical axis wind turbine power generation device is connected to the second AC / DC inverter via a second relay switch; the flexible solar photovoltaic power generation device is connected to the third DC / DC inverter via a third relay switch; and the integrated control box is connected to the energy storage module via a fourth relay switch.

[0035] The weather conditions during the operation of a semi-submersible offshore platform at sea are defined as clear with wind, clear without wind, cloudy with wind and cloudy with wind during the day, and cloudy with wind and cloudy with wind and cloudy with wind at night;

[0036] Definition: Sunny is the minimum light intensity that allows solar panels to function normally and output stable electricity.

[0037] The definition of windy is the minimum wind speed that enables the wind turbine to operate effectively and output stable electricity. It is assumed that there is sufficient wave energy under windy conditions.

[0038] S1: When the weather is sunny and windy, the generators are all in full power operation; the relay switches of the generators are all closed, and the integrated control box determines:

[0039] When the energy storage module is short of power, closing the fourth relay switch causes the power generation device to output power to charge the energy storage module;

[0040] When the lithium battery pack has sufficient power, the fourth relay switch is disconnected;

[0041] When the load module consumes too much power and the power output of the power generation device cannot supply sufficient power, the energy storage module is controlled to output power that is regulated, stabilized, and inverted by the DC / AC inverter to provide AC power to the load module.

[0042] S2: When the weather is clear and windless, the third relay switch and the fourth relay switch are closed to enable the flexible solar photovoltaic power generation device to output electric energy to charge the energy storage module or power the load;

[0043] S3: When the weather is cloudy, rainy, and windy, the third relay is disconnected, and the first and second relays are closed to allow the wave energy generator and the combined vertical axis wind turbine generator to jointly supply power, ensuring that the energy storage module is fully charged. The fourth relay is closed to allow the wave energy generator and the combined vertical axis wind turbine generator to provide AC power to the load module through voltage regulation and inversion.

[0044] S4: When the weather is rainy and windless, disconnect all power generation devices, retract the flexible blades of the combined vertical axis wind turbine power generation device, and put the power generation system into a nearly stopped state; use the energy storage module to provide AC power to the load module while ensuring the normal basic power supply of the semi-submersible offshore platform; if the energy storage module is also in the feeding state, close the first relay switch to enable the wave energy power generation device to power the basic communication equipment of the semi-submersible offshore platform.

[0045] Furthermore, the following steps are included: in unknown weather conditions, the wave energy power generation device is used as the main power output, and the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device are utilized to the maximum extent through the integrated control box.

[0046] The beneficial effects of the present invention are:

[0047] 1. The semi-submersible marine platform wind, solar, and water storage multi-energy complementary power supply system and operation method of the present invention fully and efficiently utilizes marine energy in a limited space by integrating the multi-energy complementarity of multiple renewable energy sources, and couples the wave energy generation system, wind energy generation system, and solar photovoltaic power generation system; reasonably configures the bus voltage, controls the number and efficiency of AC / DC and DC / DC conversions in the system, reduces system losses while meeting the system power supply requirements, and realizes the function of AC to DC conversion and power transmission or DC to AC power transmission on the semi-submersible marine platform.

[0048] 2. The present invention overcomes the shortcomings of excessive power transmission losses in near-sea and far-sea platforms, insufficient power generation conversion efficiency of a single structure, unstable power output, and low utilization rate of marine clean energy; the control system is managed and maintained in a unified manner, with low operating costs, high energy utilization, and stable power output.

[0049] 3. The present invention solves the problems existing in a single power generation system and provides a complete technical solution for the system implementation: it uses an energy storage system to store and recover excess load power generated by the wave energy power generation system, the combined vertical axis wind turbine power generation system, and the flexible solar photovoltaic power generation system, and integrates and utilizes multiple renewable energy sources at sea through new energy power generation technology, thereby improving resource utilization, greatly reducing the impact of the proportion of different renewable energy sources in different time, space, environmental and climatic conditions on the power generation system, and ensuring the reliability of power supply.

[0050] 4. When the power generation of the three power generation devices is insufficient to meet the load's electricity needs, the present invention uses the energy storage module to transmit electricity to the load, solving the problems of energy stability and efficient utilization. It also realizes the storage and management of electric energy with a capacity of more than 100 kW h, achieving effective and full utilization of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a functional block diagram of an embodiment of the present invention.

[0052] Figure 2 It is a functional block diagram of an energy storage module according to an embodiment of the present invention.

[0053] Figure 3 is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] See also Figure 1 , an embodiment of the present invention includes a wave energy power generation device, a flexible solar photovoltaic power generation device, a combined vertical axis wind turbine power generation device, an integrated control box, a BMS intelligent management module, an energy storage module, a BMS management module and a load module.

[0056] The wave energy power generation device and the combined vertical axis wind turbine power generation device are directly connected to their respective corresponding AC / DC inverters, the AC / DC inverter is further connected to the DC / DC inverter, and the flexible solar photovoltaic power generation device is directly connected to the DC / DC inverter. The three power generation devices are combined in parallel and connected to the integrated control box, which is connected to the energy storage module and the load module.

[0057] In this embodiment, the wave energy power generation device uses eight oscillating float power generation devices arranged in an array around a semi-submersible offshore platform. Each wave energy power generation device is equipped with multiple energy-harvesting floats. Leveraging the advantages of the semi-submersible offshore platform as a large-scale marine structure, it absorbs energy at multiple points, maximizing the efficiency of wave energy utilization. The floats transmit mechanical energy to a coaxial generator to generate electricity.

[0058] The combined vertical axis wind turbine power generation device uses eight units arranged axially symmetrically on the top of a semi-submersible offshore platform. The S-shaped vertical axis wind turbine in the upper half of the combined wind turbine provides starting torque, and the H-shaped vertical axis wind turbine in the lower half achieves efficient power generation. Wind from any direction can drive the blades to rotate, and the captured wind energy is transmitted by rotating the wind wheel with a accumulator. It can smooth unstable wind energy in complex situations and stabilize the circuit system within the system.

[0059] The flexible solar photovoltaic power generation device uses a new type of photosynthetic silicon energy 36V300W single crystal semi-flexible solar panel. This solar panel has the advantages of flexibility, high power generation efficiency and light weight. It is more suitable for deployment on the surface of a semi-submersible marine platform, and can reduce obstacles, collect solar energy over the largest area, and improve the energy utilization efficiency of photovoltaic power generation.

[0060] One of the energy storage module devices is a 48V 200Ah lithium battery pack, which uses group management to solve the problem of excessive charging and discharging and reduce the number of charge and discharge times. The battery supplies power to AC loads through inverter or directly supplies power to DC loads. The entire battery storage part achieves the purpose of energy buffering.

[0061] Lithium batteries are used to store electricity generated by several power generation devices. When there is insufficient energy at sea and the lithium battery pack has sufficient power, the excess power after the battery pack is fully charged can not only supply power to the load, but also transmit electricity to the power grid.

[0062] The load is the life operation system of the entire platform. After the electric energy is distributed by the integrated control box, it is transmitted to various construction operation structures and life circuits.

[0063] The integrated control box is electrically connected to the load via a bidirectional inverter.

[0064] A charge and discharge control module is provided in the integrated control box.

[0065] The integrated control box can collect external and internal information, including meteorological information, water resource information, load power consumption information, energy storage module power information, inverter electrical information, relay opening and closing information, etc. After processing and analyzing the data, a reasonable control strategy is used to achieve coordinated control of the power supply within the system, maximize energy utilization efficiency, avoid frequent charging and discharging of battery energy storage modules and over-discharge conditions, extend service life, and improve the economy of the microgrid system.

[0066] The integrated control box is connected to a display screen to monitor power generation energy data in real time.

[0067] The integrated control box can cope with large power load fluctuations, maintain system stability, ensure that the DC bus output voltage deviation is less than ±10%, and ensure energy balance between the power generation device, energy storage module and load, and stable output voltage and frequency.

[0068] The output voltage of the wave energy power generation device, flexible solar photovoltaic power generation device, and combined vertical axis wind turbine power generation device is stabilized, regulated, and subjected to constant current processing by the AC / DC and DC / DC inverters and the three-phase rectifier inside the integrated control box. The output is a stable voltage, which is used to charge the energy storage module through the integrated control box. When necessary, the three power generation devices can be converted into electricity of suitable load through the integrated control box to supply power to the load.

[0069] Refer to the attached Figure 2 The energy storage module is also electrically connected to an intelligent battery management module (BMS), which can monitor the status of the energy storage module while performing charge and discharge protection on the energy storage module. A charge and discharge control module is provided in the integrated control box. After the charge and discharge control module is connected to the intelligent battery management module, it controls the charge and discharge of the energy storage module. The control strategy of the energy storage module uses the energy storage terminal voltage as the main reference parameter to control the energy storage module to select one of the charging mode, idle mode, and discharge mode. During the process, the energy storage module status is monitored at any time, and the charging voltage and current are adjusted in real time. When the energy storage module power reaches the set upper limit, the intelligent battery management module stops charging according to the received feedback signal; if the semi-submersible marine platform needs to start the operating system at a certain moment, the power of the energy storage module is converted into suitable AC power for the load through the inverter.

[0070] The energy storage module's charge and discharge control strategy can prevent undercharging and deep discharge. When the charging current of the energy storage module is too high, the unloading circuit current limit protection is activated. To prevent overvoltage during charging, an input overvoltage protection limit is set. To prevent deep discharge of the energy storage module, the battery terminal voltage and current are detected to determine whether to activate power-off protection.

[0071] The intelligent battery management module has basic functions such as electrical equipment control, data information collection and processing, voltage and current monitoring and feedback, fault warning, database management, and human-computer interaction. It maintains the stable operation of the microgrid, improves the energy utilization efficiency of the power supply in the microgrid, and ensures the quality of the microgrid's output power.

[0072] The energy storage module is electrically connected to the load through a DC / AC inverter. The energy storage module is connected to the grid to transmit electricity. After passing through the DC / AC inverter and phase-locked frequency conversion, the DC electricity is converted into AC electricity that meets the grid requirements. After being connected to the electricity meter to measure the power consumption, the electricity is connected to the grid for transmission.

[0073] The output ends of the wave energy power generation device, the flexible solar photovoltaic power generation device, and the combined vertical axis wind turbine power generation device are respectively provided with relay switches. After the output end of the power generation device is connected to the relay switch, it is connected to the control box through the inverter; the control box and the energy storage battery pack are connected to the charge and discharge management intelligent system to manage and protect the charge and discharge of the energy storage battery pack. When the amount of electricity generated by the power generation device is large enough and exceeds the threshold of the relay coil, the integrated control box feeds back the relay switch to temporarily interrupt or slow down the operation of part of the power generation device.

[0074] The control box can use a chip processor with an integrated management system and an external touch screen to observe and manage power generation energy data in real time.

[0075] See also Figure 3 The wind, solar, water and storage multi-energy complementary microgrid system of the present invention has the ability to cope with the unpredictable climate and day and night changes at sea. When the marine platform is operating at sea, it may encounter four main weather conditions: sunny with wind, sunny without wind, cloudy with wind, and cloudy with rain without wind. At night, it may encounter cloudy with wind and cloudy with rain without wind. The definition of sunny is the minimum light intensity that can make the solar panels work normally to produce stable electricity; windy is defined as the minimum wind force that can make the wind turbine generator set operate effectively and output stable electricity. It is assumed that the wave energy is sufficient under windy conditions. The following will be combined with the attached Figure 3 The principle that the microgrid system of the present invention is affected by weather and each power generation device is regulated by the integrated control box is elaborated in detail.

[0076] When the weather is clear and windy, the three power generation devices are in full power operation. The relays of the three main power generation devices are closed, and the AC power output by the wave energy power generation device and the combined vertical axis wind turbine power generation device is rectified by AC / DC, and then input into the integrated control box after DC / DC voltage regulation with the flexible solar photovoltaic power generation device. The controller is connected to the energy storage module and the load respectively. When the energy storage module is short of power, the relay switch connected to the energy storage module is closed to charge the energy storage module. When the lithium battery pack has sufficient power, the connected relay is disconnected. When the load module of the semi-submersible marine platform consumes too much power and direct power generation cannot supply sufficient power, the power output by the energy storage module is subjected to DC / AC voltage regulation, voltage stabilization, and inversion to provide AC power to the load.

[0077] When the weather is clear and windless, the power generation device is in half-power operation state, mainly relying on the closure of the relay connected to the photovoltaic power generation system to charge the energy storage module or power the load, and ensure that the energy storage module has sufficient power.

[0078] When the weather is cloudy, rainy and windy, the relay connected to the photovoltaic power generation system is disconnected, and the wave energy power generation device and the combined vertical axis wind turbine power generation device jointly supply power to ensure that the energy storage module is fully charged. After the two power generation devices are regulated and inverted through AC / DC and DC / DC, the power generation devices are coordinated by the integrated control box to provide AC power to the load.

[0079] During rainy, windless weather, the relays for all three generators can be disconnected, the flexible blades of the combined vertical axis wind turbine generator retracted, and the power generation system is nearly stopped. At this point, the energy storage module can be used to provide AC power to the load while ensuring the normal power supply of the semi-submersible offshore platform. If the energy storage module is also in the feeding state, the relay for the wave power generator is closed to power the semi-submersible offshore platform's basic communication equipment.

[0080] Taking into account the complementary characteristics between power generation devices, the combined vertical axis wind turbine power generation device and the photovoltaic power generation device are intermittent, and the wave energy power generation continuity is relatively better. Therefore, the microgrid uses the wave energy power source as the main output power source, and on this basis, the deployment strategy of the integrated control box is used to maximize the use of contraction control of the wind turbine power generation device and the photovoltaic power generation device.

[0081] The DC / AC inverter connected to the energy storage module is an AC / DC bidirectional inverter device that converts DC power or DC power output from the energy storage battery pack into AC power suitable for the load. The converted AC voltage is then converted to high voltage through a transformer and transmitted to the high-voltage grid. This DC / AC inverter conversion is based on the grid's transmission voltage and current requirements, ensuring safe and stable power transmission to the grid. Depending on the load-side voltage requirements, it can adapt to 220V / 380V or other voltages to protect parallel microgrids from impacts.

[0082] The present invention uses an energy storage system to store excess load power generated by wave power generation devices, flexible solar photovoltaic power generation devices, and combined vertical axis wind turbine power generation devices. When the power generation is insufficient to meet the load power demand, the power is delivered to the load to solve the problem of energy stability and efficient utilization. This solution can achieve energy storage management of more than 100KW·h, realizing effective and full utilization of electricity; it integrates the multi-energy complementarity of multiple renewable energy sources, fully and efficiently utilizes marine energy within a limited space, and couples wave power generation devices, flexible solar photovoltaic power generation devices, and combined vertical axis wind turbine power generation devices; it overcomes the problems of poor power output stability and insufficient supply caused by the operation of a single power generation device, and is uniformly managed and maintained by a control system, resulting in low operating costs, high energy utilization, and stable power output; it rationally configures the bus voltage, controls the number and efficiency of AC / DC and DC / DC conversions within the system, and has low system losses while meeting the system power supply requirements.

[0083] The above embodiments are intended only to illustrate the design concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. A wind, solar, water and storage multi-energy complementary power supply system for a semi-submersible offshore platform, characterized by: It includes power generation device, inverter, integrated control box, energy storage module and load module; The power generation device includes a wave power generation device, a flexible solar photovoltaic power generation device, and a combined vertical axis wind turbine power generation device; The inverter includes a first AC / DC inverter, a first DC / DC inverter, a second AC / DC inverter, a second DC / DC inverter, a third DC / DC inverter, and a DC / AC inverter; The wave energy power generation device is sequentially connected to a first AC / DC inverter and a first DC / DC inverter; The combined vertical axis wind turbine power generation device is sequentially connected to the second AC / DC inverter and the second DC / DC inverter; The flexible solar photovoltaic power generation device is connected to a third DC / DC inverter; The output ends of the first DC / DC inverter, the second DC / DC inverter and the third DC / DC inverter are connected in parallel to the integrated control box; the integrated control box is connected to the energy storage module and the load module respectively; the AC / DC inverter, the DC / DC inverter and the three-phase rectifier inside the integrated control box are used to stabilize, regulate and process the output voltage of the wave energy power generation device, the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device; the integrated control box is also used to output the processed voltage to charge the energy storage module, or to invert the output voltage of the wave energy power generation device, the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device to power the load module; The energy storage module is connected to the load module through a DC / AC inverter, which is used to convert direct current into alternating current that meets the grid connection requirements through a DC / AC inverter and phase-locked frequency conversion, and then connected to the electric energy meter to measure the power and then transmit power to the load module for grid connection; Also includes a relay switch; The relay switch includes a first relay switch, a second relay switch, a third relay switch and a fourth relay switch; The wave energy power generation device is connected to the first AC / DC inverter via a first relay switch; The combined vertical axis wind turbine power generation device is connected to the second AC / DC inverter via a second relay switch; The flexible solar photovoltaic power generation device is connected to a third DC / DC inverter via a third relay switch; The integrated control box is connected to the energy storage module via the fourth relay switch; The relay switch is used to receive feedback from the integrated control box when the amount of electricity generated by the generator exceeds the threshold of the relay coil, temporarily interrupting or slowing down the operation of part of the generator; The integrated control box uses a chip processor with an integrated management system to collect, process and analyze external and internal information, coordinate and control the power supply in the system, maximize energy utilization efficiency, avoid frequent charging and discharging of the energy storage module and over-discharge, extend the service life of the energy storage module, and improve the economy of the system; the charge and discharge control module is used to cope with power load fluctuations, maintain the stability of the system, make the DC bus output voltage deviation less than ±10%, and ensure the energy balance between the power generation device, energy storage module and load module, and the output voltage and frequency are stable; External information includes meteorological information and water resource information; internal information includes load power information, energy storage module power information, inverter electrical information and relay opening and closing information; The load module is the life operation system of the semi-submersible offshore platform, which is used to receive the electric energy distributed by the integrated control box and transmit it to various construction operation structures and life circuits; It also includes a bidirectional inverter for connecting the integrated control box and the load modules; It also includes a display screen externally connected to the integrated control box for operators to observe power generation energy data in real time; it also includes a BMS intelligent battery management module, which is respectively connected to the charge and discharge control module and the energy storage module of the integrated control box. The BMS intelligent battery management module includes a charge and discharge protection module, a balancing control module, a current detection module, a capacity control module, and a real-time data management module; The charge and discharge protection module is used to control the charge and discharge mode of the energy storage module with the energy storage terminal voltage as a reference parameter, and to manage and protect the charge and discharge of the energy storage module; the charge and discharge mode of the energy storage module includes a charge mode, an idle mode, and a discharge mode; The balancing control module is used to set the input overvoltage protection upper limit to prevent the energy storage module from charging overvoltage; The current detection module is used to put the unloading circuit into current limiting protection when the charging current of the energy storage module is too large; The capacity control module is used to stop charging the energy storage module according to the received feedback signal when the power of the energy storage module reaches a set upper limit; The real-time data management module is used to monitor the status of the energy storage module in real time, adjust the charging voltage and current in real time, convert the electric energy for the load through the inverter when the semi-submersible offshore platform needs to start the operating system, and detect the voltage and current of the battery terminal and determine whether to start the power-off protection to prevent the deep discharge of the energy storage module; The BMS intelligent battery management module is also used for electrical equipment control, data information collection and processing, voltage and current monitoring feedback, fault warning, database management and human-computer interaction to maintain the stable operation of the microgrid, improve the energy utilization efficiency of the power supply in the microgrid, and ensure the quality of the power output of the microgrid.

2. The semi-submersible ocean platform wind, solar, water and storage multi-energy complementary power supply system according to claim 1 is characterized by: The wave energy power generation device uses multiple liftable array oscillating float power generation devices arranged around a semi-submersible marine platform; each liftable array oscillating float power generation device is equipped with multiple energy-capturing floats; the energy-capturing floats are used to utilize the semi-submersible marine platform to absorb energy at multiple points and transmit mechanical energy to a coaxial generator for power generation.

3. The semi-submersible ocean platform wind, solar, water and storage multi-energy complementary power supply system according to claim 1 is characterized by: The combined vertical axis wind turbine power generation device uses multiple wind turbines arranged axially symmetrically on the top of a semi-submersible offshore platform; the S-type vertical axis wind turbine in the upper part of the combined wind turbine is used to provide starting torque, and the H-type vertical axis wind turbine in the lower part is used to generate electricity efficiently, so that wind in any direction drives the blades to rotate; the combined vertical axis wind turbine power generation device relies on the rotation of the wind wheel with a storage battery to transmit the captured wind energy, smooth out unstable wind energy in complex situations, and stabilize the circuit within the system.

4. The semi-submersible ocean platform wind, solar, water and storage multi-energy complementary power supply system according to claim 1 is characterized by: Flexible solar photovoltaic power generation devices use bendable photosynthetic silicon single crystal semi-flexible solar panels, which are arranged on the surface of a semi-submersible marine platform to reduce obstacles, collect solar energy over the largest area, and improve the energy utilization efficiency of photovoltaic power generation.

5. The semi-submersible ocean platform wind, solar, water and storage multi-energy complementary power supply system according to claim 1 is characterized by: The energy storage module includes group-managed batteries; the batteries use 48V 200Ah lithium batteries; the batteries are used to power AC loads through inversion or directly power DC loads, and also to achieve the purpose of energy buffering by storing the electricity generated by the power generation device. When the offshore energy is insufficient and the battery power is sufficient, the excess electricity will be provided to the load or transmitted to the power grid.

6. The method for operating the wind, solar, water and storage multi-energy complementary power supply system for a semi-submersible offshore platform according to any one of claims 1 to 5, characterized in that: The following steps are involved: S0: Build a wind, solar, water and storage multi-energy complementary power supply system for a semi-submersible marine platform; including a power generation device, an inverter, an integrated control box, an energy storage module and a load module; the power generation device includes a wave energy power generation device, a flexible solar photovoltaic power generation device, and a combined vertical axis wind turbine power generation device; the inverter includes a first AC / DC inverter, a first DC / DC inverter, a second AC / DC inverter, a second DC / DC inverter, a third DC / DC inverter, and a DC / AC inverter; The wave energy power generation device is sequentially connected to a first AC / DC inverter and a first DC / DC inverter; The combined vertical axis wind turbine power generation device is sequentially connected to the second AC / DC inverter and the second DC / DC inverter; The flexible solar photovoltaic power generation device is connected to a third DC / DC inverter; The output ends of the first DC / DC inverter, the second DC / DC inverter and the third DC / DC inverter are connected in parallel to the integrated control box; the integrated control box is connected to the energy storage module and the load module respectively; The energy storage module is connected to the load module through a DC / AC inverter; Also includes a relay switch; the relay switch includes a first relay switch, a second relay switch, a third relay switch and a fourth relay switch; The wave energy power generation device is connected to the first AC / DC inverter via a first relay switch; The combined vertical axis wind turbine power generation device is connected to the second AC / DC inverter via a second relay switch; The flexible solar photovoltaic power generation device is connected to the third DC / DC inverter via the third relay switch; the integrated control box is connected to the energy storage module via the fourth relay switch; The weather conditions during the operation of a semi-submersible offshore platform at sea are defined as sunny with wind, sunny without wind, cloudy with rain and wind, and cloudy with rain and wind without wind during the day, and cloudy with rain and wind, and cloudy with rain and wind without wind at night; Definition: Sunny is the minimum light intensity for solar panels to function normally and output stable electricity. The definition of wind is the minimum wind force that enables the wind turbine to operate effectively and output stable electricity. It is assumed that the wave energy is sufficient under windy conditions. S1: When the weather is clear and windy, the generators are all in full power operation; the relay switches of the generators are all closed, and the integrated control box determines: When the energy storage module is short of power, closing the fourth relay switch enables the power generation device to output power to charge the energy storage module; When the lithium battery pack has sufficient power, the fourth relay switch is disconnected; When the load module consumes too much power and the power output of the power generation device cannot supply sufficient power, the energy storage module is controlled to output power that is regulated, stabilized, and inverted by the DC / AC inverter to provide AC power to the load module. S2: When the weather is clear and windless, close the third relay switch and the fourth relay switch to enable the flexible solar photovoltaic power generation device to output electric energy to charge the energy storage module or to supply power to the load; S3: When the weather is cloudy, rainy and windy, disconnect the third relay, close the first relay switch and the second relay switch to jointly power the wave energy power generation device and the combined vertical axis wind turbine power generation device to ensure that the energy storage module is in a fully charged state; close the fourth relay switch to enable the wave energy power generation device and the combined vertical axis wind turbine power generation device to provide AC power to the load module after voltage regulation and inversion; S4: When the weather is rainy and windless, disconnect all power generation devices, retract the flexible blades of the combined vertical axis wind turbine power generation device, and put the power generation system into a nearly stopped state; use the energy storage module to provide AC power to the load module while ensuring the normal basic power supply of the semi-submersible offshore platform; If the energy storage module is also in the feeding state, the first relay switch is closed, so that the wave energy power generation device supplies power to the basic communication equipment of the semi-submersible marine platform.

7. The operating method according to claim 6, characterized in that: The following steps are also included: In unknown weather conditions, the wave energy power generation device is used as the main power output, and the flexible solar photovoltaic power generation device and the combined vertical axis wind turbine power generation device are utilized to the maximum extent through the integrated control box.

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