Ship berthing energy recovery system based on flywheel energy storage and energy scheduling method

Abstract

The application relates to the technical field of ship energy recovery, in particular to a ship berthing energy recovery system based on a flywheel energy storage device and an energy scheduling method. The system comprises an energy capturing device, a hydraulic power distributor, a transmission mechanism, a flywheel energy storage device and an energy management and scheduling module. The energy capturing device is responsible for receiving and capturing the kinetic energy generated when the ship is berthing. Then, the captured kinetic energy is converted into mechanical energy through the hydraulic power distributor. Next, the transmission mechanism transmits the converted mechanical energy to the flywheel energy storage device for storage. The recovered energy can be dynamically allocated for use according to the demand of a port micro-grid through the energy management and scheduling module, so that the port energy utilization rate and system scheduling flexibility are improved, and energy waste is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship energy recovery, in particular to a ship berthing energy recovery system based on flywheel energy storage and an energy scheduling method. BACKGROUND

[0002] In the prior art, the impact kinetic energy generated when a ship docks is mainly passively absorbed by fenders, buffer devices, etc., and most of the kinetic energy is converted into heat energy or dissipated through structural deformation, and cannot be effectively recovered and utilized. Even if some energy recovery technologies such as hydraulic or elastic energy storage are used in some applications, the recovered energy is only used for local consumption, and cannot be effectively linked with the port micro-grid system, so it cannot participate in the overall energy scheduling and optimal management of the port, resulting in low utilization rate of recovered energy and insufficient flexibility of port energy system scheduling.

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

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

[0005] To solve the above technical problems, the first aspect of the present application provides a ship berthing energy recovery system based on flywheel energy storage, which specifically comprises:

[0006] An energy capture device arranged on a wharf wall for capturing the kinetic energy generated by the impact of a ship and converting it into hydraulic energy;

[0007] A transmission mechanism connected to the energy capture device for converting the hydraulic energy obtained by the energy capture device into mechanical energy;

[0008] A flywheel energy storage device connected to the transmission mechanism for storing the mechanical energy obtained by the transmission mechanism.

[0009] The ship berthing energy recovery system based on flywheel energy storage further comprises:

[0010] An energy storage assembly for storing electrical energy;

[0011] An energy conversion device, the power input end of which is connected to the flywheel energy storage device, the power output end of which is connected to the energy storage assembly and the port micro-grid, for converting the mechanical energy stored in the flywheel energy storage device into electrical energy and transmitting it to the energy storage assembly and / or the port micro-grid.

[0012] The ship berthing energy recovery system based on the flywheel energy storage, wherein the transmission mechanism comprises 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 connected with the flywheel energy storage device through a gear and a hydraulic accumulator respectively to form a parallel gear transmission path and a hydraulic energy buffer path, and the mode switching clutch is used to adopt the direct gear transmission path when the input mechanical energy does not reach a preset threshold, and adopt the hydraulic energy buffer path when the input mechanical energy reaches the preset threshold.

[0013] The ship berthing energy recovery system based on the flywheel energy storage, wherein the flywheel energy storage device comprises a vacuum container and a flywheel, a motor and a bearing assembly arranged in the vacuum container, the flywheel is connected with the motor and the vacuum container through the bearing assembly to drive the flywheel to rotate by the motor.

[0014] The second aspect of the present 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, and specifically comprises the following steps:

[0015] constructing an output model of an energy output system of the port, wherein the energy output system at least comprises the ship berthing energy recovery system;

[0016] establishing constraint conditions of each device of the port micro-grid under normal working conditions, wherein the constraint conditions comprise operation constraints, interaction constraints between the port and a superior power grid and power balance constraints;

[0017] constructing an energy scheduling model according to the output model and the constraint conditions, with the objective of minimizing the operation cost of the port micro-grid;

[0018] solving the energy scheduling model to obtain an energy scheduling strategy of the port micro-grid, and performing energy scheduling on the energy output system based on the energy scheduling strategy.

[0019] The energy scheduling method for ship berthing energy recovery based on flywheel energy storage, wherein the energy output system further comprises a photovoltaic power generation system and a wind power generation output system, and the step of constructing an output model of an energy output system of the port specifically comprises the following steps:

[0020] obtaining first system parameters of the photovoltaic power generation system and solar radiation intensity, and constructing an output model of the photovoltaic power generation system according to the first system parameters and the solar radiation intensity;

[0021] acquire second system parameters and weather data of the wind power generation system, and construct an output model of the wind power generation system according to the second system parameters and the weather data;

[0022] acquire flywheel parameters and charge-discharge parameters of the energy storage component of the ship shore energy recovery system, and construct an output model based on the ship shore energy recovery system based on the flywheel parameters and the charge-discharge parameters.

[0023] The energy scheduling method of the ship shore energy recovery based on the flywheel energy storage, wherein the output model of the ship shore energy recovery system based on the flywheel energy storage comprises an output model of the flywheel energy storage device and an output model of the energy storage component, wherein the output model of the flywheel energy storage device and the output model of the energy storage component are respectively represented as:

[0024] ,

[0025] ,

[0026] 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, represents the output energy of the energy storage component at the moment, represents the output energy of the energy storage component at the moment, represents the charging power stored to the energy storage component through the energy conversion device at the moment, represents the discharging power of the energy storage component to the port micro-grid at the moment, represents the charging efficiency, represents the discharging efficiency at the moment.

[0027] The energy scheduling method of the ship shore energy recovery based on the flywheel energy storage, wherein the operation constraint comprises an operation constraint of the ship shore energy recovery system based on the flywheel energy storage, wherein the operation constraint of the ship shore energy recovery system based on the flywheel energy storage is:

[0028] ,

[0029] ,

[0030] ,

[0031] ,

[0032] wherein, is a binary variable, indicating whether to charge or discharge.

[0033] 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 comprises:

[0034] obtaining the port micro-grid and the upper-level grid interaction cost and the power generation load cost of the thermal power unit;

[0035] calculating the local load electricity income according to the actual output energy of the energy output system of the port;

[0036] constructing an objective function based on the upper-level grid interaction cost, the power generation load cost and the local load electricity income.

[0037] 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 interaction power of each period with the upper-level grid and the discharge power of the energy storage; and the energy scheduling of the energy output system based on the energy scheduling strategy specifically comprises:

[0038] controlling 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 interaction power of each period with the upper-level grid and the discharge power of the energy storage.

[0039] Advantages: Compared with the prior art, the ship berthing energy recovery system based on flywheel energy storage technology and the energy scheduling method thereof are provided, which comprises an energy capturing device, a hydraulic power distributor, a transmission mechanism and a flywheel energy storage device. The energy capturing device is responsible for capturing the kinetic energy generated when the ship is berthing and converting it into hydraulic energy. Then, the converted hydraulic energy is transmitted to the transmission mechanism after being integrated by the hydraulic power distributor. Next, 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 is berthing and convert it into mechanical energy for storage in the flywheel energy storage device, thereby realizing effective recovery of the berthing kinetic energy and avoiding waste of kinetic energy due to collision. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1A structural schematic diagram of a ship berthing energy recovery system based on flywheel energy storage is provided in the embodiments of the present application.

[0042] Figure 2 A structural schematic diagram of a flywheel energy storage device.

[0043] Figure 3 An application scenario schematic diagram of an energy scheduling method of ship berthing energy recovery based on flywheel energy storage is provided in the embodiments of the present application.

[0044] Figure 4 A flowchart of an energy scheduling method of ship berthing energy recovery based on flywheel energy storage is provided in the embodiments of the present application. DETAILED DESCRIPTION

[0045] The embodiments of the present application provide a ship berthing energy recovery system and an energy scheduling method based on flywheel energy storage. In order to make the purpose, technical solutions and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0046] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an" and "the" as used herein include plural references. It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. 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 the other element, or there can be intermediate elements. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0047] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art 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 meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0048] It should be understood that the sequence numbers and sizes of the steps in the embodiments do not mean the order of execution, and the execution order of the processes is determined by their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0049] Research has revealed that with the increasing depletion of non-renewable energy sources, energy issues continue to receive significant attention. As humanity explores new energy sources to replace non-renewable ones, the effective recycling and reuse of energy has become crucial. With the continuous expansion of ports, the impact energy generated when ships dock is increasingly seen as a potential energy resource. Currently, ships are typically slowed down through collisions with quay walls, but the kinetic energy generated by these collisions is often wasted, leading to unnecessary energy losses.

[0050] To address the aforementioned issues, this application provides a ship berthing energy recovery system 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. When a ship berths, the collision between the ship and the energy capture device generates kinetic energy. The energy capture device captures this kinetic energy, converts it into hydraulic energy, and transmits it to the hydraulic power distributor. The hydraulic power distributor integrates this 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. The mechanical energy is stored 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 stored in the flywheel energy storage device, thereby achieving effective recovery of berthing kinetic energy and avoiding the waste of kinetic energy caused by collisions.

[0051] This embodiment provides a ship berthing energy recovery system based on flywheel energy storage technology, such as... Figure 1 As 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. Multiple energy capture devices 10 can be arranged at intervals along the quay wall. Each energy capture device 10 is connected to the transmission mechanism 20, which in turn is connected to the flywheel energy storage device 30. The energy capture device 10 is used to capture the kinetic energy generated by the ship impacting the energy capture device when berthing, converting the kinetic energy into hydraulic energy and transmitting it to the transmission mechanism 20. The transmission mechanism 20 converts the hydraulic energy into mechanical energy and transmits it to the flywheel energy storage device 30, driving the flywheel in the flywheel energy storage device 30 to rotate and store the mechanical energy.

[0052] The energy capturing device 10 is arranged on the wharf wall, and the energy capturing device 10 is used for capturing the kinetic energy generated by the collision of the ship with the wharf wall when the ship docks, and converting the kinetic energy into hydraulic energy, and then transmitting the hydraulic energy to the transmission mechanism, and then converting the hydraulic energy into mechanical energy by the transmission mechanism, and then storing the mechanical energy in the flywheel energy storage device, so that the kinetic energy generated by the collision of the ship with the wharf wall when the ship docks is utilized, and energy waste is avoided.

[0053] As shown in Figure 1 The energy capturing device 10 includes a hydraulic buffer assembly 101 for being fixed on the wharf wall, a hydraulic pipeline 102, and a hydraulic power distributor 103, the hydraulic buffer assembly 101 is connected with the hydraulic power distributor 103 through the hydraulic pipeline 102, and the hydraulic power distributor 103 is connected with the transmission mechanism 20. The hydraulic buffer assembly 101 includes an elastic member and a transducer, and the elastic member is connected with the transducer. When the ship collides with the elastic member, the elastic member extrudes the hydraulic piston in the transducer, and then pushes the hydraulic oil to flow from the transducer into the hydraulic power distributor through the hydraulic pipeline, converts the kinetic energy generated by the collision of the ship into hydraulic energy, and realizes the capturing of the kinetic energy. The hydraulic power distributor 103 is used for integrating the hydraulic energy transmitted through the hydraulic pipeline 102, so as to improve the stability of the hydraulic energy. In addition, the hydraulic buffer assembly 101 can be provided with a pressure sensor and a ship identification assembly, the pressure of the hydraulic buffer device is monitored through the pressure sensor, and the safe operation of the ship docking energy recovery system based on the flywheel energy storage technology is ensured. The ship information of the ported ship is identified through the ship identification assembly, so as to adjust the hydraulic buffering strength and energy conversion parameters of the hydraulic buffer assembly according to the ship information.

[0054] As shown in Figure 1As shown, the transmission mechanism includes a hydraulic motor 201, a transmission 202, and a mode switching clutch 203, which are connected in cascade. The mode switching clutch 203 is connected to the flywheel energy storage device 30 through gears and hydraulic accumulators to form a parallel gear transmission path and a hydraulic energy buffer path. The hydraulic motor 201 drives the transmission 202 to move under the action of the hydraulic oil transmitted by the hydraulic power distributor 103, 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 which supports stepless speed regulation to match the flywheel speed requirement of the flywheel in the flywheel energy storage device. The mode switching clutch 203 is provided with a Hall sensor which is used to measure input energy. When the energy does not reach a threshold value (such as 500 kW), the mode switching clutch is closed to adopt the gear transmission path; when the threshold value is reached, the mode switching clutch is opened to adopt the hydraulic accumulator path to buffer the impact energy.

[0055] As shown, Figure 2 The flywheel energy storage device 30 includes a vacuum container 301 and a flywheel unit arranged in 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 high-speed rotation and releases the energy when needed. The rotating shaft of the flywheel 302 is connected to the motor 303, which drives the flywheel to rotate to convert the mechanical energy transmitted by the transmission mechanism into 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 in the vacuum container 301 through 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 by the motor 303. During the process of releasing the stored energy, the motor 303 functions as a generator.

[0056] Further, the vacuum container includes a container shell and a molecular pump set. The container shell is connected to the molecular pump set to maintain the container shell in a vacuum state through the molecular pump set, for example, the internal vacuum degree of the container shell is maintained to be ≤ Pa, and the internal vacuum degree of the container shell is maintained to be ≤ Pa. The container shell can be made of double-layer stainless steel or carbon fiber. The flywheel can be a carbon fiber wound rotor. The diameter, rotational speed, and energy storage capacity of the carbon fiber wound rotor can be set according to actual requirements, for example, the diameter is 2 m, the design rotational speed is 30000 rpm, and the energy storage capacity is 500 kWh. The bearing assembly can include a hybrid support of active magnetic suspension bearing and permanent magnetic bearing, and the radial suspension gap can be 50-70 The axial preload is adjusted in real time by a PID controller.

[0057] It should be noted that in practical applications, multiple sets of flywheel units can be set in the vacuum container. These multiple sets of flywheel units are independent of each other and connected in parallel through electromagnetic clutches, so that the multiple sets of flywheel units can operate independently or in coordination, thereby improving the fault tolerance energy and energy storage capacity of the flywheel energy storage device.

[0058] In one implementation, such as Figure 1 As shown, 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 terminal of the energy conversion device 40 is connected to the flywheel energy storage device 30, and the power output terminal of the energy conversion device 40 is connected to the energy storage component 50 and the port microgrid. The energy conversion device converts the mechanical energy stored in the flywheel energy storage device 30 into electrical energy and transmits it to the energy storage component 50 and / or the port microgrid. The energy storage component 50 may include a supercapacitor bank, or it may include a supercapacitor bank and a lithium battery bank, etc. The energy conversion device 40 can be 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 energy storage mode, the permanent magnet synchronous motor is operated 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 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 reducing its speed.

[0059] In summary, this application provides a ship berthing energy recovery system based on flywheel energy storage. The system includes energy capture devices spaced along the quay wall to absorb the kinetic energy of a ship berthing and convert it into hydraulic energy output. A hydraulic power distributor distributes the energy to a transmission mechanism, which converts the hydraulic energy into mechanical energy to drive the flywheel energy storage device to store mechanical energy. An energy conversion device then converts the mechanical energy of the flywheel energy storage device into electrical energy, transmitting it to the energy storage medium and / or the port microgrid interface. This achieves the recovery and reuse of energy generated by a ship berthing using flywheel energy storage, avoiding the waste of kinetic energy caused by collisions. Simultaneously, the recovered energy can be used for port operations, reducing port operating costs.

[0060] Based on the aforementioned flywheel energy storage-based ship berthing energy recovery system, this application provides an energy dispatching method for ship berthing energy recovery based on flywheel energy storage. One application scenario of this method is a port, such as... Figure 3As shown, the port is configured with a thermal power generating unit, a new energy generating unit (including a photovoltaic power generation system and a wind power generation system), a ship berthing energy recovery system based on a flywheel energy storage (i.e., a flywheel energy storage device), and a superior power grid, and the port is arranged with various port power equipment. 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 a flywheel energy storage provided in the embodiments of the present application.

[0061] Specifically, as shown in the method specifically includes: Figure 4 As shown, the method specifically includes:

[0062] S10, constructing an output model of an energy output system of a port, wherein the energy output system at least includes the ship berthing energy recovery system;

[0063] S20, establishing a constraint condition of each device of a port micro-grid under a normal working condition, the constraint condition including an operation constraint, an interaction constraint of the port and a superior power grid, and a power balance constraint;

[0064] S30, constructing an energy scheduling model according to the output model and the constraint condition, with a minimum port micro-grid operation cost as a target;

[0065] S40, solving the energy scheduling model to obtain an energy scheduling strategy of the port micro-grid, and performing energy scheduling on the energy output system based on the energy scheduling strategy.

[0066] Specifically, in step S10, the energy output system refers to a system capable of providing electric energy in the port, and the energy output system includes the ship berthing energy recovery system based on a flywheel energy storage. In addition, the port can also be equipped with a thermal power generating unit, a wind power generation system, a photovoltaic power generation system, etc. The energy output system can be a single thermal power generating unit, a wind power generation system, or a photovoltaic power generation system, or a combination of one or more of them.

[0067] Exemplarily, the energy output system further includes a photovoltaic power generation system and a wind power generation system. That is, the energy output system includes a photovoltaic power generation system, a wind power generation system, and a ship berthing energy recovery system based on a flywheel energy storage, and accordingly, the constructing an output model of an energy output system of a port specifically includes:

[0068] S11, acquiring a first system parameter of the photovoltaic power generation system and a solar radiation intensity, and constructing an output model of the photovoltaic power generation system according to the first system parameter and the solar radiation intensity;

[0069] S12. Obtain the second system parameters and weather data of the wind power generation system, and construct the output model of the wind power generation system based on the second system parameters and the weather data;

[0070] S13. Obtain the flywheel parameters and the charging and discharging parameters of the energy storage components of the ship berthing energy recovery system, and construct an output model based on the flywheel parameters and the charging and discharging parameters of the ship berthing energy recovery system.

[0071] 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. Solar radiation intensity reflects the illumination conditions of the environment where the photovoltaic power generation system is located. By combining the first system parameters and solar radiation intensity, a photovoltaic output model can be constructed, and the energy output of the photovoltaic power generation system can be calculated based on this model. Specifically, the photovoltaic output model can be expressed as:

[0072] ,

[0073] ,

[0074] in, Indicates the power temperature coefficient. express The output power of the photovoltaic power generation system at all times This indicates the maximum power output of the photovoltaic power generation system under standard rated conditions. express The actual light intensity at any given time This represents the light radiant density under standard rated conditions, and its value can be... , This indicates the rated ambient temperature, which can be 298K. express Real-time solar panel temperature; express Real-time ambient temperature Indicates wind speed.

[0075] Specifically, in step S12, the second system parameters of the wind power generation system refer to the inherent data of the wind power generation system, encompassing key information such as wind turbine blade radius, tip speed ratio, and blade pitch angle. Weather data reflects the wind conditions of the environment in which the wind power generation system is located, encompassing key information such as air density and wind speed. By combining the second system parameters and weather data, a wind power output model can be constructed, and based on this model, the energy output of the wind power generation system can be calculated. Specifically, the wind power output model can be expressed as:

[0076] ,

[0077] in, Indicates air density; Indicates the radius of the wind turbine blade; Indicates wind speed. Indicates the maximum wind energy capture factor; Indicates the tip speed ratio; Indicates the blade pitch angle. Indicates a constant coefficient. express The output power of the wind power generation system at any given time.

[0078] Furthermore, in step S13, the ship berthing energy recovery system based on flywheel energy storage can provide energy through its included flywheel energy storage device. When it is equipped with energy storage components, energy can be provided synchronously through the flywheel energy storage device and the energy storage components. In a specific implementation, the ship berthing energy recovery system based on flywheel energy storage is equipped with energy storage components. Accordingly, 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 components. The output model of the flywheel energy storage device is constructed based on the inherent parameters of the flywheel and the relevant parameters of flywheel energy storage. The output model of the energy storage components is constructed based on the charging and discharging power of the energy storage components. The charging and discharging power can include the charging and discharging power on the energy loop between the flywheel energy storage device and the energy storage components, and / or the charging and discharging power on the energy loop between the energy storage components and the port microgrid.

[0079] Based on this, the output model of the flywheel energy storage device and the output model of the energy storage component are respectively expressed as:

[0080] ,

[0081] ,

[0082] in, This indicates the output energy of the flywheel energy storage device. This represents the moment of inertia of the flywheel. Indicates the angular velocity of the flywheel. Indicates energy storage components Energy output at all times Indicates energy storage components Energy output at all times express The charging power that is constantly stored in the energy storage component through the energy conversion device. express The discharge power of the energy storage components to the port microgrid at all times. represents the charging efficiency, represents discharging efficiency at the moment.

[0083] Further, in step S20, after the output model of each output system is constructed, a constraint condition can be constructed based on the output model of the output system, wherein the constraint condition can include a constraint condition for the operation of the port micro-grid, which can include an operation constraint, an interaction constraint between the port and the upper-level power grid, and a power balance constraint, and the operation constraint can include operation constraint conditions of various output systems, such as operation constraints of a photovoltaic power generation system, operation constraints of a wind power generation output system, and operation constraints of a ship berthing energy recovery system based on a flywheel energy storage.

[0084] Specifically, the operation constraint of the photovoltaic power generation system is used to ensure the normal operation of the photovoltaic power generation system, and the operation constraint of the photovoltaic power generation system can be represented as:

[0085] ,

[0086] wherein, represents the maximum output power of the photovoltaic power generation system, represents the minimum output power of the photovoltaic power generation system.

[0087] The operation constraint of the wind power generation output system is used to ensure the normal operation of the wind power generation output system, and the operation constraint of the wind power generation output system can be represented as:

[0088] ,

[0089] wherein, represents the maximum output power of the wind power generation output system, represents the minimum output power of the wind power generation output system.

[0090] The operation constraint of the ship berthing energy recovery system based on a flywheel energy storage is used to ensure the normal operation of the ship berthing energy recovery system based on a flywheel energy storage, and the constraint of the ship berthing energy recovery system based on a flywheel energy storage can be represented as:

[0091] ,

[0092] ,

[0093] ,

[0094] ,

[0095] ,

[0096] wherein, represents the output energy of the flywheel energy storage device, represents the charging power stored to the energy storage assembly via the energy conversion device at time t, represents the output energy of the energy storage assembly at time t, represents the minimum energy storage energy allowed by the energy storage assembly, represents the maximum energy storage energy allowed by the energy storage assembly, represents the minimum charging power of the energy storage assembly, represents the maximum charging power of the energy storage assembly, represents the minimum discharging power of the energy storage assembly, represents the discharging power of the energy storage assembly to the port microgrid at time t, represents the maximum discharging power of the energy storage assembly, , is a binary variable representing the charging / discharging variable at time t.

[0097] Further, the interaction constraints of the port with the upper grid are used to constrain the buying / selling power of the port, wherein the interaction constraints of the port with the upper grid can be represented as:

[0098] ,

[0099] ,

[0100] wherein, represents the buying power of the microgrid from the upper grid at time t, represents the selling power of the microgrid to the upper grid at time t, represents the maximum buying power of the microgrid from the upper grid, represents the maximum selling power of the microgrid to the upper grid, is a binary variable representing the buying / selling state variable at time t.

[0101] Further, the power balance constraint is used to ensure that the supply power and the consumption power of the port are balanced, wherein the supply power of the port includes the purchased power, the power generated by the photovoltaic power generation system, the power generated by the wind power generation system, the recovered power provided by the ship berthing energy recovery system based on the flywheel energy storage, and the output power of the port generator, and the consumption power of the port includes the sold power and the port load power. Accordingly, the power balance constraint can be expressed as:

[0102] ,

[0103] represents the purchased power of the microgrid from the upper-level power grid at the moment t, represents the sold power of the microgrid to the upper-level power grid at the moment t, represents the output power of the photovoltaic power generation system at the moment t, represents the output power of the wind power generation system at the moment t, represents the output power of the port generator at the moment t, represents the discharge power of the energy storage component at the moment t, represents the port load power at the moment t.

[0104] In one implementation, the objective function is a port microgrid operation cost function, and the construction process of the objective function specifically includes obtaining the upper-level power grid interaction cost and the power generation load cost of the thermal power generator; calculating the local load power consumption benefit according to the actual output energy of the energy output system of the port; and constructing the objective function based on the upper-level power grid interaction cost, the power generation load cost and the local load power consumption benefit. Then, the objective function is solved with the objective of minimizing the objective function (i.e., with the objective of minimizing the port microgrid operation cost) to obtain the energy scheduling strategy of the port microgrid. That is, the energy scheduling strategy that minimizes the objective function can be solved under the constraint condition. The objective function can be expressed as:

[0105] ,

[0106] ,

[0107] ,

[0108] ,

[0109] represents the microgrid operation cost,​​​​​​​​​ represents the interaction cost of the micro-grid with the upper grid, represents the port load electricity income, represents the operation cost of the port generator, represents the purchase electricity price from the grid, represents the selling electricity price to the grid, represents the load electricity price, all represent constant coefficients.

[0110] Further, in steps S30 and S40, after the energy scheduling model is obtained, the energy scheduling model is solved with the objective of minimizing the port micro-grid operation cost, and the energy scheduling strategy of the port micro-grid can be obtained, wherein the solving method can adopt an existing method, which is not specifically described here. The energy scheduling strategy can include the output power of the port generator, the interaction power with the upper grid, and the energy storage discharge power. Then, the port generator can be controlled according to the output power of the port generator, the upper grid can be interacted with according to the interaction power with the upper grid, and the energy storage component in the ship berthing energy recovery system based on flywheel energy storage can be controlled 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 port micro-grid operation cost.

[0111] In summary, the embodiment provides an energy scheduling method for ship berthing energy recovery based on flywheel energy storage. The method considers the global information of the port, combines each output system that can provide electric energy in the port and the port electric quantity load information, constructs an energy scheduling model with the operation constraints of each output system, the interaction constraints of the port and the grid, and the power balance constraints as constraint conditions, and the port micro-grid operation cost as the objective function, solves the energy scheduling model with the objective of minimizing the port micro-grid operation cost, obtains the energy scheduling strategy of the port, and schedules the port micro-grid according to the energy scheduling strategy, thereby achieving efficient scheduling and utilization of energy.

[0112] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part 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: Energy capture devices, installed on the quay wall, are used to capture the kinetic energy generated by ship impacts and convert it into hydraulic energy; A transmission mechanism, connected to the energy harvesting device, is used to convert the hydraulic energy obtained by the energy harvesting device into mechanical energy. A flywheel energy storage device, connected to the transmission mechanism, is used to store the mechanical energy converted by the transmission mechanism; Energy storage components are used to store electrical energy; An energy conversion device, whose power input terminal is connected to the flywheel energy storage device and whose power output terminal is connected to the energy storage component and the port microgrid, is used to convert the mechanical energy stored in the flywheel energy storage device into electrical energy and transmit it to the energy storage component and / or the port microgrid. The energy capture device includes a hydraulic buffer assembly, hydraulic lines, and a hydraulic power distributor for fixing to the shore wall. The hydraulic buffer assembly is connected to the hydraulic power distributor via the hydraulic lines, and the hydraulic power distributor is connected to a transmission mechanism. The hydraulic buffer assembly includes an elastic element and a transducer, and the elastic element is connected to the transducer. The transmission mechanism includes a hydraulic motor, a gearbox, and a mode-switching clutch connected in sequence. The hydraulic motor drives the gearbox to rotate. The mode-switching clutch is connected to the flywheel energy storage device through gears and a hydraulic accumulator to form a parallel gear transmission path and a hydraulic energy buffer path. The mode-switching clutch is used to use the gear transmission path when the input mechanical energy does not reach a preset threshold, and to use the hydraulic energy buffer path when the input mechanical energy reaches the preset threshold.

2. 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 disposed in the vacuum container. The flywheel is connected to the motor and the vacuum container through the bearing assembly so that the motor drives the flywheel to rotate.

3. An energy dispatching method for ship berthing energy recovery based on flywheel energy storage, characterized in that, The energy dispatching method for ship berthing energy recovery based on flywheel energy storage, applied to any one of claims 1-2, specifically includes: Construct an output model for the port's energy output system, wherein the energy output system includes at least the ship berthing energy recovery system; Establish constraints for each device in the port microgrid under normal operating conditions. These constraints include operational constraints, interaction constraints between the port and the upstream power grid, and power balance constraints. Based on the power output model and the constraints, an energy dispatch model is constructed with the goal of minimizing the operating cost of the port microgrid. Solve the energy dispatch model to obtain the energy dispatch strategy of the port microgrid, and perform energy dispatch on the energy output system based on the energy dispatch strategy.

4. The energy dispatching method for ship berthing energy recovery based on flywheel energy storage according to claim 3, characterized in that, The energy output system also includes a photovoltaic power generation system and a wind power generation system. The specific output model for constructing the port's energy output system includes: Obtain the first system parameters and solar radiation intensity of the photovoltaic power generation system, and construct the output model of the photovoltaic power generation system based on the first system parameters and the solar radiation intensity; The second system parameters and weather data of the wind power generation system are obtained, and the output model of the wind power generation system is constructed based on the second system parameters and the weather data. Obtain the flywheel parameters and the charging and discharging parameters of the energy storage components of the ship berthing energy recovery system, and construct an output model based on the flywheel parameters and the charging and discharging parameters of the ship berthing energy recovery system.

5. The energy dispatching method for ship berthing energy recovery based on flywheel energy storage according to claim 3, characterized in that, The process of constructing the objective function of the energy scheduling model specifically includes: Obtain the interaction cost between the port microgrid and the upper-level power grid, as well as the power generation load cost of thermal power units; Calculate the local load electricity revenue based on the actual output energy of the port's energy output system; An objective function is constructed based on the interaction cost of the upstream power grid, the generation load cost, and the local load electricity revenue.

6. The energy dispatching method for ship berthing energy recovery based on flywheel energy storage according to claim 3, characterized in that, The energy dispatch strategy includes the output power of thermal power units, the power exchanged with the upper-level power grid at different times, and the energy storage discharge power. The energy scheduling of the energy output system based on the energy scheduling strategy specifically includes: The charging and discharging of the thermal power unit and energy storage components are controlled according to the output power of the thermal power unit, the interaction power with the upper-level power grid at different times, and the energy storage discharge power.

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