Flywheel energy storage-based ship docking energy recovery system and energy scheduling method

Abstract

The invention relates to the technical field of ship energy recovery, in particular to a ship docking energy recovery system based on flywheel energy storage and an energy dispatching method. The system comprises an energy capture device, a hydraulic power distributor, a transmission mechanism, a flywheel energy storage device and an energy management and dispatching module. The energy capturing device is responsible for receiving and capturing kinetic energy generated when the ship is in shore, and then the captured kinetic energy is converted into mechanical energy through the hydraulic power distributor. And then, the transmission mechanism transmits the converted mechanical energy to the flywheel energy storage device for storage. The recovered energy can be dynamically allocated and used through the energy management and scheduling module according to the port micro-grid requirement, the port energy utilization rate and the system scheduling flexibility are improved, and energy waste is reduced.

Description

Technical Field

[0001] This application relates to the technical field of ship energy recovery, and particularly to a ship berthing energy recovery system and an energy scheduling method based on flywheel energy storage. Background Art

[0002] In the prior art, the impact kinetic energy generated when a ship berths is mainly absorbed passively by fenders, buffer devices, etc. Most of the kinetic energy is converted into heat energy or dissipated through structural deformation, and effective recovery and utilization cannot be achieved. Even in some applications, technologies such as hydraulic or elastic energy storage are used to recover part of the energy, but the recovered energy is only locally consumed and cannot be effectively linked with the port microgrid system, and cannot participate in the overall energy scheduling and optimization management of the port, resulting in low recovery energy utilization rate and insufficient flexibility in the port energy system scheduling.

[0003] Therefore, the prior art still needs to be improved and enhanced. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a ship berthing energy recovery system and an energy scheduling method based on flywheel energy storage in view of the deficiencies of the prior art.

[0005] To solve the above technical problem, the first aspect of this application provides a ship berthing energy recovery system based on flywheel energy storage. Specifically, the ship berthing energy recovery system based on flywheel energy storage includes: An energy capture device, arranged on the dock wall, for capturing the kinetic energy generated by the ship's impact and converting it into hydraulic energy; A transmission mechanism, connected to the energy capture device, for converting the hydraulic energy converted by the energy capture device into mechanical energy; A flywheel energy storage device, connected to the transmission mechanism, for storing the mechanical energy converted by the transmission mechanism.

[0006] The ship berthing energy recovery system based on flywheel energy storage further includes: An energy storage component, for storing electric energy; An energy conversion device, whose power input end is connected to the flywheel energy storage device, and whose power output end is connected to the energy storage component and the port microgrid, for converting the mechanical energy stored in the flywheel energy storage device into electric energy and transmitting it to the energy storage component and / or the port microgrid.

[0007] The described ship berthing energy recovery system based on flywheel energy storage, wherein the transmission mechanism includes a hydraulic motor, a transmission, and a mode switching clutch connected in sequence. The hydraulic motor is used to drive the transmission to rotate; the mode switching clutch is respectively connected to the flywheel energy storage device through a gear and a hydraulic accumulator to form a parallel gear transmission path and a hydraulic energy buffer path; the mode switching clutch is used to adopt the direct gear transmission path when the input mechanical energy does not reach the preset threshold, and adopt the hydraulic energy buffer path when the input mechanical energy reaches the preset threshold.

[0008] The described ship berthing energy recovery system based on flywheel energy storage, wherein the flywheel energy storage device includes a vacuum container and a flywheel, a motor, and a bearing assembly arranged in the vacuum container. The flywheel is connected to the motor and the vacuum container through the bearing assembly to drive the flywheel to rotate through the motor.

[0009] The second aspect of this application provides an energy scheduling method for ship berthing energy recovery based on flywheel energy storage, which is applied to the ship berthing energy recovery system based on flywheel energy storage as described above. The energy scheduling method for ship berthing energy recovery based on flywheel energy storage specifically includes: Construct an output model of the energy output system of the port, wherein the energy output system at least includes the ship berthing energy recovery system; Establish the constraint conditions for the normal operation of each device in the port microgrid. The constraint conditions include operation constraints, interaction constraints between the port and the superior power grid, and power balance constraints; According to the output model and the constraint conditions, construct an energy scheduling model with the goal of minimizing the operation cost of the port microgrid; Solve the energy scheduling model to obtain the energy scheduling strategy of the port microgrid, and perform energy scheduling on the energy output system based on the energy scheduling strategy.

[0010] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the energy output system further includes a photovoltaic power generation system and a wind power output system. The specific construction of the output model of the energy output system of the port includes: Obtain the first system parameters of the photovoltaic power generation system and the solar radiation intensity, and construct the output model of the photovoltaic power generation system according to the first system parameters and the solar radiation intensity; Obtain the second system parameters of the wind power output system and the weather data, and construct the output model of the wind power output system according to the second system parameters and the weather data; Obtain the flywheel parameters of the ship berthing energy recovery system and the charge-discharge parameters of the energy storage component, and construct an output model based on the ship berthing energy recovery system based on the flywheel parameters and the charge-discharge parameters.

[0011] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the output model of the ship berthing energy recovery system based on flywheel energy storage includes the output model of the flywheel energy storage device and the output model of the energy storage component, and wherein the output models of the flywheel energy storage device and the energy storage component are respectively expressed as: , , wherein, represents the output energy of the flywheel energy storage device, represents the moment of inertia of the flywheel, represents the angular velocity of the flywheel rotation, represents the energy storage component the output energy at time, represents the energy storage component the output energy at time, represents the charging power stored in the energy storage component through the energy conversion device at time, represents the discharging power of the energy storage component to the port microgrid at time, represents the charging efficiency, represents the discharging efficiency at time.

[0012] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the operation constraints include the operation constraints of the ship berthing energy recovery system based on flywheel energy storage, and wherein the operation constraints of the ship berthing energy recovery system based on flywheel energy storage are: , , , , wherein, is a binary variable indicating whether to charge or discharge.

[0013] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the construction process of the objective function of the energy scheduling model specifically includes: Obtain the interaction cost between the port microgrid and the superior power grid and the power generation load cost of the thermal power unit; Calculate the electricity revenue of the local load according to the actual output energy of the energy output system of the port; Construct an objective function based on the interactive cost of the superior power grid, the power generation load cost, and the electricity revenue of the local load.

[0014] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the energy scheduling strategy based on the energy scheduling strategy includes the output power of the thermal power unit, the interactive power with the superior power grid at each time period, and the energy storage discharge power; the specific energy scheduling of the energy output system based on the energy scheduling strategy includes: Control the charging and discharging of the thermal power unit and the energy storage component according to the output power of the thermal power unit, the interactive power with the superior power grid at each time period, and the energy storage discharge power.

[0015] Beneficial effects: Compared with the prior art, the present application provides a ship berthing energy recovery system and its energy scheduling method based on flywheel energy storage technology. The system includes an energy capture device, a hydraulic power distributor, a transmission mechanism, and a flywheel energy storage device. The energy capture device is responsible for capturing the kinetic energy generated when the ship berths and converting it into hydraulic energy. Subsequently, the converted hydraulic energy is integrated by the hydraulic power distributor and transmitted to the transmission mechanism. Then, the transmission mechanism converts the hydraulic energy into mechanical energy and transmits it to the flywheel energy storage device for storage. In this way, the system can effectively capture the kinetic energy generated when the ship berths and convert it into mechanical energy for storage in the flywheel energy storage device, thereby realizing the effective recovery of the berthing kinetic energy and avoiding the waste of kinetic energy caused by collisions. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the structural schematic diagram of the ship berthing energy recovery system based on flywheel energy storage provided by the embodiment of the present application.

[0018] Figure 2 It is the structural schematic diagram of the flywheel energy storage device.

[0019] Figure 3 It is a schematic diagram of an application scenario of the energy scheduling method for ship berthing energy recovery based on flywheel energy storage provided by the embodiment of the present application.

[0020] Figure 4This is a flowchart of the energy scheduling method for ship docking energy recovery based on flywheel energy storage provided by the embodiments of the present application. Detailed implementation manners

[0021] The embodiments of the present application provide a ship docking energy recovery system and an energy scheduling method based on flywheel energy storage. To make the purpose, technical solutions and effects of the present application clearer and more definite, the following further describes the present application in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "including" used in the specification of the present application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0023] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the field to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0024] It should be understood that the sequence numbers and magnitudes of the steps in this embodiment do not mean the order of execution. The execution order of each process is determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0025] Through research, it has been found that with the increasing depletion of non-renewable energy sources, the energy issue has continuously received high attention from people. In the process of humans' continuous exploration of new energy sources to replace non-renewable energy sources, how to effectively recover and reuse energy has also become crucial. With the continuous expansion of port scales, the impact energy generated when ships dock has gradually been regarded as a potential energy resource. Currently, ships are usually decelerated by colliding with the quay wall, but the kinetic energy generated by these collisions is usually wasted, resulting in unnecessary energy losses.

[0026] To solve the above problems, in the embodiments of the present application, a ship berthing energy recovery system based on flywheel energy storage technology is provided. The system includes an energy capture device, a hydraulic power distributor, a transmission mechanism, and a flywheel energy storage device. When the ship berths, the ship collides with the energy capture device to generate kinetic energy. The energy capture device captures the kinetic energy and converts it into hydraulic energy, and then transmits it to the hydraulic power distributor. The hydraulic power distributor integrates the hydraulic energy and transmits it to the transmission mechanism. The transmission mechanism converts the integrated hydraulic energy into mechanical energy and transmits it to the flywheel energy storage device, and stores the mechanical energy through the high-speed rotation of the flywheel in the flywheel energy storage device. In this way, the system can effectively capture the kinetic energy generated when the ship berths, and convert it into mechanical energy and store it in the flywheel energy storage device, thus realizing the effective recovery of the berthing kinetic energy and avoiding the waste of kinetic energy caused by collision.

[0027] The embodiments of the present application provide a ship berthing energy recovery system based on flywheel energy storage technology, as Figure 1 shown. The ship berthing energy recovery system based on flywheel energy storage technology includes an energy capture device 10, a transmission mechanism 20, and a flywheel energy storage device 30. There can be multiple energy capture devices 10, and the multiple energy capture devices 10 are arranged at intervals along the dock wall. The energy capture device 10 is connected to the transmission mechanism 20, and the transmission mechanism 20 is connected to the flywheel energy storage device 30. The energy capture device 10 is used to capture the kinetic energy generated when the ship berths due to hitting the energy capture device, and convert the kinetic energy into hydraulic energy and then transmit it to the transmission mechanism 20. The transmission mechanism 20 converts the hydraulic energy into mechanical energy and then transmits it to the flywheel energy storage device 30 to drive the flywheel in the flywheel energy storage device to rotate to store the mechanical energy.

[0028] In the embodiments of the present application, by arranging several energy capture devices on the dock wall, capturing the kinetic energy generated when the ship berths due to collision with the shore by the energy capture device, converting the kinetic energy into hydraulic energy and then transmitting it to the transmission mechanism, and converting the hydraulic energy into mechanical energy by the transmission mechanism and storing it in the flywheel energy storage device, the kinetic energy generated when the ship berths due to collision with the shore is realized, and energy waste is avoided. At the same time, arranging several energy capture devices on the dock wall can play a buffering role in the ship collision, protecting the dock and the ship from damage.

[0029] As Figure 1As shown, the energy capture device 10 includes a hydraulic buffer assembly 101 for fixing on the shore wall, a hydraulic pipeline 102, and a hydraulic power distributor 103. The hydraulic buffer assembly 101 is connected to the hydraulic power distributor 103 through the hydraulic pipeline 102, and the hydraulic power distributor 103 is connected to the transmission mechanism 20. The hydraulic buffer assembly 101 includes an elastic member and a transducer, and the elastic member is connected to the transducer. When the ship impacts the elastic member, the elastic member squeezes the hydraulic piston in the transducer, and then pushes the hydraulic oil to flow from the transducer through the hydraulic pipeline into the hydraulic power distributor, converting the kinetic energy formed by the ship impact into hydraulic energy to achieve kinetic energy capture. The hydraulic power distributor 103 is used to integrate the hydraulic energy transmitted through the hydraulic pipeline 102 to improve the stability of the hydraulic energy. In addition, a pressure sensor and a ship identification component can be provided on the hydraulic buffer assembly 101 to monitor the pressure of the hydraulic buffer device through the pressure sensor to ensure the safe operation of the ship docking energy recovery system based on the flywheel energy storage technology. The ship identification component is used to identify the ship information of the ship docking at the port, so as to adjust the hydraulic buffer strength and energy conversion parameters of the hydraulic buffer assembly according to the ship information.

[0030] As Figure 1 shown, the transmission mechanism includes a hydraulic motor 201, a transmission 202, and a mode switching clutch 203. The hydraulic motor 201, the transmission 202, and the mode switching clutch 203 are cascaded in sequence. The mode switching clutch 203 is connected to the flywheel energy storage device 30 through a gear and a hydraulic accumulator to form a parallel gear transmission path and a hydraulic energy buffer path. The hydraulic motor 201 is driven by the hydraulic oil transmitted by the hydraulic power distributor 103 to drive the transmission 202 to move, so as to convert the hydraulic energy into mechanical energy and then transmit it to the flywheel energy storage device 30 to drive the flywheel in the flywheel energy storage device 30 to rotate. The transmission 202 can adopt a planetary gear transmission, and the planetary gear transmission supports stepless speed regulation to match the flywheel speed requirements of the flywheel in the flywheel energy storage device. A Hall sensor is provided in the mode switching clutch 203, and the Hall sensor is used to measure the input energy. When the energy does not reach the threshold (such as 500 kW), the mode switching clutch is closed and the gear transmission path is adopted; when the threshold is reached, the mode switching clutch is opened and the hydraulic accumulator path is adopted to buffer the impact energy.

[0031] As Figure 2As shown, the flywheel energy storage device 30 includes a vacuum container 301 and a flywheel unit disposed within the vacuum container. The flywheel unit includes a flywheel 302, a motor 303, and a bearing assembly 304. The flywheel 302 stores mechanical energy by rotating at high speed and releases this energy when needed. The rotating shaft of the flywheel 302 is connected to the motor 303. The motor 303 drives the flywheel to rotate, converting the mechanical energy transmitted by the transmission mechanism into the rotational energy of the flywheel. The rotating shaft of the flywheel is connected to the vacuum container 301 through the bearing assembly 304 and is supported within the vacuum container 301 by the bearing assembly 304. When the flywheel energy storage device 30 starts to store energy, the motor 303 drives the flywheel 302 to rotate to store energy. When the flywheel energy storage device 30 starts to release the stored energy, the flywheel 302 starts to decelerate, and its rotational kinetic energy is converted into electrical energy through the motor 303. During the process of releasing the stored energy, the motor 303 acts as a generator.

[0032] Further, the vacuum container includes a container housing and a molecular pump group. The container housing is connected to the molecular pump group to keep the container housing in a vacuum state through the molecular pump group. For example, the internal vacuum degree of the container housing is maintained at ≤ Pa, etc., for reducing air resistance and friction, and its internal vacuum degree is maintained at ≤ Pa. Among them, the container housing can be made of double-layer stainless steel or carbon fiber and other materials. The flywheel can adopt a carbon fiber wound rotor, and the diameter, rotational speed, and energy storage capacity of the carbon fiber wound rotor can be set according to actual needs. For example, the diameter is 2m, the designed rotational speed is 30000rpm, and the energy storage capacity is 500kWh. The bearing assembly can include a hybrid support of an active magnetic bearing and a permanent magnet bearing, and the radial suspension gap can be 50 - 70 , and the axial preload is adjusted in real time by a PID controller.

[0033] It should be noted that in actual applications, multiple groups of flywheel units can be arranged in the vacuum container. The multiple groups of flywheel units are independent of each other and are connected in parallel through electromagnetic clutches, enabling the multiple groups of flywheel units to operate independently or cooperatively, improving the fault-tolerant energy and energy storage capacity of the flywheel energy storage device.

[0034] In one implementation, as Figure 1As shown in the figure, the ship berthing energy recovery system based on flywheel energy storage may further include an energy storage component 50 and an energy conversion device 40. The power input end of the energy conversion device 40 is connected to the flywheel energy storage device 30, and the power output end of the energy conversion device 40 is connected to the energy storage component 50 and the port microgrid. The mechanical energy stored in the flywheel energy storage device 30 is converted into electrical energy by the energy conversion device and transmitted to the energy storage component 50 and / or the port microgrid. Among them, the energy storage component 50 may include a supercapacitor bank, or may include a supercapacitor bank and a lithium battery bank, etc. The energy conversion device 40 may adopt a permanent magnet synchronous motor, and the energy conversion device 40 is connected to the energy storage component 50 and the port microgrid through a bidirectional converter 501. When the energy conversion device 40 is in the energy storage mode, the permanent magnet synchronous motor operates as a generator, and its output electrical energy is stored in the energy storage component 50 and / or transmitted to the port microgrid through the bidirectional converter 501. When the energy conversion device is in the energy release mode, the electrical energy provided by the energy storage component and / or the port microgrid is transmitted to the energy conversion device through the bidirectional converter, and then transmitted to other electrical equipment in the port through the energy conversion device. At this time, the flywheel energy storage device can provide energy by decelerating.

[0035] In summary, the embodiment of the present application provides a ship berthing energy recovery system based on flywheel energy storage. The system includes energy capture devices arranged at intervals along the quay wall, which are used to absorb the kinetic energy of the ship during berthing and convert it into hydraulic energy for output; the hydraulic power distributor distributes the energy to the transmission mechanism, and the hydraulic energy is converted into mechanical energy through the transmission mechanism to drive the flywheel energy storage device to store mechanical energy; and the mechanical energy of the flywheel energy storage device is converted into electrical energy through the energy conversion device and transmitted to the energy storage medium and / or the port microgrid interface, realizing the recovery and reuse of the energy formed by the ship berthing with flywheel energy storage, and avoiding the waste of kinetic energy caused by collisions. At the same time, the recovered energy can also be used in the port to reduce the port operation cost.

[0036] Based on the above ship berthing energy recovery system based on flywheel energy storage, the embodiment of the present application provides an energy scheduling method for ship berthing energy recovery based on flywheel energy storage. One application scenario of the method is a port, such as Figure 3 As shown in the figure, the port is equipped with a thermal power unit, new energy units (including a photovoltaic power generation system and a wind power output system), a ship berthing energy recovery system based on flywheel energy storage (i.e., a flywheel energy storage device), and a superior power grid, and there are various port electrical equipment arranged in the port. The method is arranged on a port power grid management platform, and the port power grid management platform performs energy scheduling on the port by running the energy scheduling method for ship berthing energy recovery based on flywheel energy storage provided by the embodiment of the present application.

[0037] Specifically, as Figure 4 shown, the method specifically includes: S10. Construct an output model for the energy output system of the port, where the energy output system at least includes the ship berthing energy recovery system; S20. Establish the constraint conditions for each device in the port microgrid under normal operating conditions. The constraint conditions include operation constraints, interaction constraints between the port and the superior power grid, and power balance constraints; S30. According to the output model and the constraint conditions, construct an energy scheduling model with the goal of minimizing the operating cost of the port microgrid; S40. Solve the energy scheduling model to obtain the energy scheduling strategy for the port microgrid, and perform energy scheduling on the energy output system based on the energy scheduling strategy.

[0038] Specifically, in step S10, the energy output system refers to a system that can provide electric energy within the port. This energy output system includes a ship berthing energy recovery system based on flywheel energy storage. In addition, the port can also be equipped with thermal power generation units, wind power output systems, photovoltaic power generation systems, etc. The energy output system can be a single thermal power generation unit, wind power output system, or photovoltaic power generation system, or a combination of one or more of them.

[0039] Exemplarily, the energy output system further includes a photovoltaic power generation system and a wind power output system. That is, the energy output system includes a photovoltaic power generation system, a wind power output system, and a ship berthing energy recovery system based on flywheel energy storage. Correspondingly, the construction of the output model for the energy output system of the port specifically includes: S11. Obtain the first system parameters of the photovoltaic power generation system and the solar radiation intensity, and construct the output model of the photovoltaic power generation system according to the first system parameters and the solar radiation intensity; S12. Obtain the second system parameters of the wind power output system and the weather data, and construct the output model of the wind power output system according to the second system parameters and the weather data; S13. Obtain the flywheel parameters of the ship berthing energy recovery system and the charge-discharge parameters of the energy storage components, and construct the output model based on the ship berthing energy recovery system based on the flywheel parameters and the charge-discharge parameters.

[0040] Specifically, in step S11, the first system parameters of the photovoltaic power generation system refer to the inherent data of the photovoltaic power generation system, covering key information such as installation location, tilt angle, and azimuth angle. The solar radiation intensity reflects the lighting conditions of the environment where the photovoltaic power generation system is located. By combining the first system parameters and the solar radiation intensity, a photovoltaic output model can be constructed, and based on this photovoltaic output model, the energy output of the photovoltaic power generation system can be calculated. Specifically, the photovoltaic output model can be expressed as: , , wherein, represents the power temperature coefficient, represents the output power of the photovoltaic power generation system at time represents the maximum power of the photovoltaic power generation system under standard rated conditions, represents the actual light intensity at time represents the light radiation density under standard rated conditions, and its value can be , represents the rated ambient temperature, and its value can be 298K; represents the actual temperature of the solar panel at time represents the actual ambient temperature at time represents the wind speed.

[0041] Specifically, in step S12, the second system parameter of the wind power generation output system refers to the inherent data of the wind power generation output system, covering key information such as the blade radius of the wind turbine, the tip speed ratio, and the blade pitch angle. The weather data reflects the wind conditions of the environment where the wind power generation output system is located, covering key information such as air density and wind speed. By combining the second system parameter and the weather data, a wind power output model can be constructed, and based on this wind power output model, the energy output of the wind power generation output system can be calculated. Specifically, the wind power output model can be expressed as: , wherein, represents the air density; represents the blade radius of the wind turbine; represents the wind speed, represents the maximum wind energy capture coefficient; represents the tip speed ratio; represents the blade pitch angle, represents a constant coefficient, represents the output power of the wind power generation output system at time

[0042] Further, in step S13, the ship berthing energy recovery system based on flywheel energy storage can provide energy through the flywheel energy storage device included therein. When it is configured with an energy storage component, energy can be provided synchronously by the flywheel energy storage device and the energy storage component. In a specific implementation, the ship berthing energy recovery system based on flywheel energy storage is configured with an energy storage component. Correspondingly, the output model of the ship berthing energy recovery system based on flywheel energy storage includes the output model of the flywheel energy storage device and the output model of the energy storage component. Among them, the output model of the flywheel energy storage device is constructed according to the inherent parameters of the flywheel and the parameters related to flywheel energy storage, and the output model of the energy storage component is constructed according to the charge-discharge power of the energy storage component. The charge-discharge power may include the charge-discharge power on the energy loop between the flywheel energy storage device and the energy storage component, and / or the charge-discharge power on the energy loop between the energy storage component and the port microgrid.

[0043] Based on this, the output models of the flywheel energy storage device and the energy storage component are respectively expressed as: , , Among them, represents the output energy of the flywheel energy storage device, represents the moment of inertia of the flywheel, represents the angular velocity of the flywheel rotation, represents the energy storage component output energy at time represents the energy storage component output energy at time represents the charging power stored in the energy storage component through the energy conversion device at time represents the discharging power of the energy storage component to the port microgrid at time represents the charging efficiency, represents the discharging efficiency at time

[0044] Further, in step S20, after the output model of each output system is constructed, constraint conditions can be constructed based on the output model of the output system. Among them, the constraint conditions can include the constraint conditions for the operation of the port microgrid, which can include operation constraints, interaction constraints between the port and the superior power grid, and power balance constraints. The operation constraints can include the operation constraint conditions of each output system, such as the operation constraints of the photovoltaic power generation system, the operation constraints of the wind power generation output system, and the operation constraints of the ship docking energy recovery system based on flywheel energy storage, etc. It should be noted that the constraint items included in the operation constraints can be set according to actual needs. For example, it can include the operation constraints of a single photovoltaic power generation system, the operation constraints of the wind power generation output system, and the operation constraints of the ship docking energy recovery system based on flywheel energy storage, or it can be a combination of one or more of them. Here, the operation constraints include the operation constraints of the photovoltaic power generation system, the operation constraints of the wind power generation output system, and the operation constraints of the ship docking energy recovery system based on flywheel energy storage as an example for illustration.

[0045] Specifically, the operation constraints of the photovoltaic power generation system are used to ensure the normal operation of the photovoltaic power generation system. The operation constraints of the photovoltaic power generation system can be expressed as: , where represents the maximum output power of the photovoltaic power generation system, represents the minimum output power of the photovoltaic power generation system.

[0046] The operation constraints of the wind power generation output system are used to ensure the normal operation of the wind power generation output system. The operation constraints of the wind power generation output system can be expressed as: , where represents the maximum output power of the wind power generation output system, represents the minimum output power of the wind power generation output system.

[0047] The operation constraints of the ship docking energy recovery system based on flywheel energy storage ensure the normal operation of the ship docking energy recovery system based on flywheel energy storage. The constraints of the ship docking energy recovery system based on flywheel energy storage can be expressed as: , , , , , where represents the output energy of the flywheel energy storage device, represents The charging power stored in the energy storage component from the energy conversion device at a certain moment Indicates the energy storage component The output energy at a certain moment Indicates the minimum allowable energy storage of the energy storage component Indicates the maximum allowable energy storage of the energy storage component Indicates the minimum charging power of the energy storage component Indicates the maximum charging power of the energy storage component Indicates the minimum discharge power of the energy storage component Indicates The discharge power of the energy storage component to the port microgrid at a certain moment Indicates the maximum discharge power of the energy storage component , Is a binary variable, indicating The charge-discharge variable at a certain moment

[0048] Furthermore, the interaction constraints between the port and the superior power grid are used to restrict the electricity bought and sold by the port. Among them, the interaction constraints between the port and the superior power grid can be expressed as: , , Among them, Indicates The power purchase from the superior power grid by the microgrid at a certain moment Indicates The selling power sold by the microgrid to the superior power grid at a certain moment Indicates the maximum power purchase from the superior power grid by the microgrid Indicates the maximum selling power sold by the microgrid to the superior power grid The binary variable indicates The electricity buying and selling state variable at a certain moment

[0049] Furthermore, the power balance constraint is used to ensure the balance between the supply power and the consumption power of the port. Among them, the port supply power includes the power purchase, the power generation of the photovoltaic power generation system, the power generation of the wind power generation output system, the recovery power provided by the ship docking energy recovery system based on flywheel energy storage, and the output power of the port generator. The consumption power balance of the port includes the selling power and the port load power. Accordingly, the power balance constraint can be expressed as: , Among them, Indicates The power purchase from the superior power grid by the microgrid at a certain moment Indicates The selling power sold by the microgrid to the superior power grid at a certain moment represents the output power of the photovoltaic power generation system at time represents the output power of the wind power generation output system at time represents the output power of the port generator at time represents the discharge power of the energy storage component at time represents the port load power at time

[0050] In one implementation, the objective function is the port microgrid operation cost function. The construction process of the objective function specifically includes obtaining the interaction cost between the port microgrid and the superior power grid and the power generation load cost of the thermal power unit; calculating the local load electricity consumption income according to the actual output energy of the energy output system of the port; constructing the objective function based on the superior power grid interaction cost, the power generation load cost, and the local load electricity consumption income. Then, the objective function is solved with the minimization of the objective function (i.e., with the minimization of the port microgrid operation cost as the goal) to obtain the energy scheduling strategy of the port microgrid. That is to say, under the constraint conditions, the energy scheduling strategy that minimizes the objective function can be solved. Among them, the objective function can be expressed as: , , , , Among them, represents the microgrid operation cost, represents the interaction cost between the microgrid and the superior power grid, represents the port load electricity consumption income, represents the operation cost of the port generator, represents the purchase electricity price for buying electricity from the power grid, represents the selling electricity price for selling electricity to the power grid, represents the load electricity consumption price, all represent constant coefficients.

[0051] Further, in steps S30 and S40, after obtaining the energy scheduling model, the energy scheduling model is solved with the goal of minimizing the operating cost of the port microgrid, and an energy scheduling strategy for the port microgrid can be obtained. Among them, the solution method can adopt existing methods, which will not be specifically described here. The energy scheduling strategy may include the output power of the port generator, the interaction power with the superior power grid, and the energy storage discharge power. Then, the port generator can be controlled according to the output power of the port generator, interact with the superior power grid according to the interaction power with the superior power grid, and control the energy storage component in the ship berthing energy recovery system based on flywheel energy storage to charge and discharge according to the energy storage discharge power, so as to reasonably utilize the energy recovered by the ship berthing energy recovery system based on flywheel energy storage and minimize the operating cost of the port microgrid.

[0052] In summary, this embodiment provides an energy scheduling method for ship berthing energy recovery based on flywheel energy storage. By considering the global information of the port, this method combines each power generation system that can provide electric energy in the port and the port power load information. By constructing an energy scheduling model with the operating constraints of each power generation system, the interaction constraints between the port and the power grid, and the power balance constraints as the constraint conditions and the operating cost of the port microgrid as the objective function, and solving the energy scheduling model with the goal of minimizing the operating cost of the port microgrid to obtain the energy scheduling measurement of the port, and scheduling the port microgrid according to this energy scheduling strategy, the efficient scheduling and utilization of energy are realized.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A ship berthing energy recovery system based on flywheel energy storage, characterized in that, The ship berthing energy recovery system based on flywheel energy storage specifically includes: An energy capture device, arranged on the quay wall, for capturing the kinetic energy generated by the ship's impact and converting it into hydraulic energy; A transmission mechanism, connected to the energy capture device, for converting the hydraulic energy converted by the energy capture device into mechanical energy; A flywheel energy storage device, connected to the transmission mechanism, for storing the mechanical energy converted by the transmission mechanism.

2. The ship berthing energy recovery system based on flywheel energy storage according to claim 1, characterized in that, It further includes: An energy storage component, for storing electric energy; An energy conversion device, whose power input end is connected to the flywheel energy storage device, and whose power output end is connected to the energy storage component and the port microgrid, for converting the mechanical energy stored in the flywheel energy storage device into electric energy and transmitting it to the energy storage component and / or the port microgrid.

3. The ship berthing energy recovery system based on flywheel energy storage according to claim 1, characterized in that, The transmission mechanism includes a hydraulic motor, a transmission, and a mode switching clutch connected in sequence. The hydraulic motor is used to drive the transmission to rotate; the mode switching clutch is respectively connected to the flywheel energy storage device through a gear and a hydraulic accumulator to form parallel gear transmission paths and hydraulic energy buffer paths. The mode switching clutch is used to adopt the gear transmission path when the input mechanical energy does not reach the preset threshold, and adopt the hydraulic energy buffer path when the input mechanical energy reaches the preset threshold.

4. The ship berthing energy recovery system based on flywheel energy storage according to claim 1, characterized in that, The flywheel energy storage device includes a vacuum container and a flywheel, a motor, and a bearing assembly arranged in the vacuum container. The flywheel is connected to the motor and the vacuum container through the bearing assembly to drive the flywheel to rotate through the motor.

5. An energy scheduling method for energy recovery during ship docking based on flywheel energy storage, characterized in that, Applied to the ship berthing energy recovery system based on flywheel energy storage as described in any one of claims 1-4, the energy scheduling method for the ship berthing energy recovery based on flywheel energy storage specifically includes: Construct an output model of the energy output system of the port, where the energy output system at least includes the ship berthing energy recovery system; Establish the constraint conditions for the normal operation of each device in the port microgrid. The constraint conditions include operation constraints, interaction constraints between the port and the superior power grid, and power balance constraints; According to the output model and the constraint conditions, construct an energy scheduling model with the goal of minimizing the operation cost of the port microgrid; Solve the energy scheduling model to obtain the energy scheduling strategy of the port microgrid, and perform energy scheduling on the energy output system based on the energy scheduling strategy.

6. The energy scheduling method for ship berthing energy recovery based on flywheel energy storage according to claim 5, characterized in that, The energy output system further includes a photovoltaic power generation system and a wind power output system. The construction of the output model of the energy output system of the port specifically includes: Obtain the first system parameters of the photovoltaic power generation system and the solar radiation intensity, and construct the output model of the photovoltaic power generation system according to the first system parameters and the solar radiation intensity; Obtain the second system parameters of the wind power output system and the weather data, and construct the output model of the wind power output system according to the second system parameters and the weather data; Obtain the flywheel parameters of the ship berthing energy recovery system and the charge and discharge parameters of the energy storage component, and construct the output model of the ship berthing energy recovery system based on the flywheel parameters and the charge and discharge parameters.

7. The energy scheduling method for ship berthing energy recovery based on flywheel energy storage according to claim 5 or 6, characterized in that The output model of the ship shore docking energy recovery system includes the output model of the flywheel energy storage device and the output model of the energy storage component. Among them, the output models of the flywheel energy storage device and the energy storage component are respectively expressed as: ， ， Among them, represents the output energy of the flywheel energy storage device, represents the moment of inertia of the flywheel, represents the angular velocity of the flywheel rotation, represents the energy storage component at the moment of the output energy, represents the energy storage component at the moment of the output energy, represents the charging power stored in the energy storage component from the energy conversion device at the moment, represents the discharging power of the energy storage component to the port microgrid at the moment, represents the charging efficiency, represents the discharging efficiency at the moment.

8. The energy scheduling method for energy recovery during ship berthing based on flywheel energy storage according to claim 5, characterized in that, The operation constraints include the operation constraints of the ship shore docking energy recovery system based on flywheel energy storage. Among them, the operation constraints of the ship shore docking energy recovery system based on flywheel energy storage are: ， ， ， ， Among them, is a binary variable indicating whether it is charging or discharging.

9. The energy scheduling method for ship berthing energy recovery based on flywheel energy storage according to claim 5, characterized in that, The construction process of the objective function of the energy scheduling model specifically includes: Obtain the interaction cost between the port microgrid and the superior power grid and the power generation load cost of the thermal power unit; Calculate the local load electricity consumption income according to the actual output energy of the energy output system of the port; Construct an objective function based on the interaction cost of the superior power grid, the power generation load cost, and the local load electricity consumption income.

10. The energy scheduling method for ship berthing energy recovery based on flywheel energy storage according to claim 5, characterized in that, The energy scheduling strategy based on the above includes the output power of the thermal power unit, the interaction power with the superior power grid in each time period, and the energy storage discharge power; The energy scheduling of the energy output system based on the energy scheduling strategy specifically includes: Control the charge and discharge of the thermal power unit and the energy storage component according to the output power of the thermal power unit, the interaction power with the superior power grid in each time period, and the energy storage discharge power.

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