A breeze power generation device for urban environment and control method thereof

Abstract

The present invention proposes a micro-breeze power generation device for urban environments and a control method thereof, which relate to the field of wind power generation, including wind impellers, hybrid excitation generators and energy storage devices: a group of wind impellers uniformly and unidirectionally arranged around a transmission shaft, for capturing wind energy; a hybrid excitation generator connected to the wind impellers via a transmission shaft, for converting wind energy into electrical energy, and an energy storage device connected to the hybrid excitation generator via a rectifier, for storing and outputting electrical energy; during the operation of the micro-breeze power generation device, the micro-breeze power generation device is controlled to perform different actions according to a preset rated wind speed and the residual electrical energy of the energy storage device: outputting electrical energy to the outside and storing electrical energy in the energy storage device; the present invention can be installed in various application scenarios in the city to achieve high-efficiency conversion of low-quality wind energy in the city into high-quality electrical energy, and at the same time output a stable voltage to the load end.

Description

Technical Field

[0001] The present invention belongs to the field of wind power generation, and in particular relates to a breeze power generation device for use in an urban environment and a control method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As a clean and renewable energy source, the development of the wind power industry can not only optimize the energy structure, but also improve the sustainability and safety of energy. Cities have abundant wind energy resources, but the wind speed is relatively low, and the wind energy environment fluctuates greatly and frequently due to the influence of traffic.

[0004] Not only is it difficult for traditional wind power generation devices to start and efficiently convert electricity under such low wind speed conditions, but even if they are started and running, they will be affected by the wind energy environment. The output of low-quality electricity with obvious fluctuations will damage the equipment if it is directly supplied to electrical equipment, and output to the power grid will cause grid fluctuations, making it difficult to effectively utilize wind energy. At the same time, the degree of lightweight is low, making it difficult to achieve efficient and convenient start-up and installation in various urban environments. In addition, existing wind turbines generally require external energy access to work normally and output voltage to the outside. This not only increases the difficulty of installing power generation devices in urban application scenarios, but also has a negative impact on the urban environment.

[0005] Therefore, existing technologies make it difficult to effectively utilize urban breeze wind energy and output stable, high-quality voltage; traditional power generation equipment has many installation restrictions, has a great impact on the environment, and has low actual use safety, which further limits the development and utilization of wind power. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a breeze power generation device for urban environments and a control method thereof, which can be installed in various application scenarios in the city to achieve high-efficiency conversion of low-quality wind energy in the city into high-quality electrical energy, and at the same time output stable voltage to the load end.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0008] A first aspect of the present invention provides a breeze power generation device for use in an urban environment.

[0009] A breeze power generation device for use in an urban environment, comprising a wind impeller, a hybrid excitation generator, and an energy storage device:

[0010] A group of wind turbines are evenly and unidirectionally arranged around the transmission shaft to capture wind energy; a hybrid excitation generator connected to the wind turbines via the transmission shaft is used to convert wind energy into electrical energy; an energy storage device is connected to the hybrid excitation generator via a rectifier to store and output electrical energy;

[0011] During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device;

[0012] When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage.

[0013] Furthermore, the wind impeller is a vertical axis wind impeller, and the material is bast fiber of natural fast-growing plant flax.

[0014] Furthermore, the hybrid excitation generator is a direct-drive hybrid excitation wind turbine generator that adopts hybrid excitation technology. The generator magnetic field is generated by permanent magnets and excitation current. By controlling the electric excitation method, the voltage output by the generator after rectification is stabilized at a constant value.

[0015] Furthermore, the method further includes placing the hybrid excitation generator and the energy storage device in a physical protective cover.

[0016] A second aspect of the present invention provides a control method for a breeze power generation device used in an urban environment.

[0017] A control method for a breeze power generation device for an urban environment, comprising:

[0018] During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device;

[0019] When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage.

[0020] Furthermore, the control of the breeze power generation device to perform different actions is divided into a startup phase and a normal working wind speed change phase.

[0021] Furthermore, during the startup phase, the following control is performed according to different wind speeds:

[0022] When the wind speed is lower than the rated wind speed, the energy storage device is preferentially controlled to store electric energy until the requirement for outputting electric energy is met. Then the energy storage device stops storing electric energy and outputs electric energy, while the power generation device outputs electric energy.

[0023] At rated wind speed, the energy storage device stores electrical energy but does not output electrical energy to the outside, while the power generation device outputs electrical energy to the outside.

[0024] When the wind speed is higher than the rated speed, the energy storage device stores electrical energy and outputs it to the outside, and the power generation device outputs it to the outside.

[0025] Furthermore, the requirements for outputting electrical energy are specifically:

[0026] According to different application scenarios, the user sets the remaining power threshold of the energy storage device. When the remaining power of the energy storage device is not lower than the remaining power threshold, the energy storage device meets the requirement of outputting power.

[0027] Furthermore, during the normal working wind speed change phase, the control strategy is adjusted in real time according to the wind speed fluctuation, specifically:

[0028] When the wind speed is lower than the rated speed, the energy storage device stops storing electricity and outputs electricity to the outside, while the power generation device outputs electricity to the outside;

[0029] At rated wind speed, the energy storage device stores electrical energy, the power generation device outputs electrical energy, and the energy storage device does not output electrical energy.

[0030] When the wind speed is higher than the rated speed, the energy storage device stores electrical energy, the power generation device outputs electrical energy to the outside, and the energy storage device outputs electrical energy to the outside at the same time.

[0031] Furthermore, the adjusting of the electric excitation of the hybrid excitation generator is specifically as follows:

[0032] At rated wind speed, the motor magnetic field is entirely generated by permanent magnets;

[0033] When the wind speed changes, the motor magnetic field is generated by the permanent magnet and the electric excitation, and the motor magnetic field is adjusted according to the wind speed fluctuation;

[0034] When the wind speed decreases, the energy storage device outputs a gain current for the generator excitation, generating a magnetic field identical to the generator magnetic field and enhancing the overall magnetic field of the motor;

[0035] When the wind speed increases, the energy storage device outputs a reduction current for generator excitation, generating a magnetic field opposite to the generator magnetic field and reducing the overall magnetic field of the motor.

[0036] A third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps of the micro-wind power generation device for an urban environment as described in the first aspect of the present invention.

[0037] The fourth aspect of the present invention provides an electronic device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of a micro-wind power generation device for an urban environment as described in the first aspect of the present invention are implemented.

[0038] One or more of the above technical solutions have the following beneficial effects:

[0039] In low wind speed environments or environments with large wind speed fluctuations, the present invention controls the hybrid excitation generator and energy storage device in real time to maintain the output voltage of the rectifier at a fixed value after rectification, thereby achieving high-efficiency conversion of low-quality urban wind energy into high-quality electrical energy, and at the same time outputting stable high-quality electrical energy to the load end to avoid causing grid fluctuations.

[0040] Based on a hybrid excitation generator and an energy storage device, the power generation device designed in the present invention generates all the required internal electrical energy by itself, without the need for external energy access, reducing the requirements and impact on the external environment during installation, and is highly environmentally friendly.

[0041] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0043] Figure 1 This is a front view of the breeze power generation device according to the first embodiment;

[0044] Figure 2 This is a right side view of the breeze power generation device according to the first embodiment;

[0045] Figure 3 This is a top view of the breeze power generation device according to the first embodiment;

[0046] Figure 4 It is a front view of the physical protection cover of the first embodiment;

[0047] Figure 5 It is a right side view of the physical protection cover of the first embodiment;

[0048] Figure 6 A top view of the physical protective cover of the first embodiment;

[0049] Figure 7 Schematic diagram of a vertical axis wind impeller according to a first embodiment;

[0050] Figure 8This is a structural diagram of the hybrid excitation generator of the first embodiment.

[0051] Figure 9 This is a schematic diagram of the electrical connections and control logic of the physical protective cover of the first embodiment. DETAILED DESCRIPTION

[0052] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Example 1

[0055] In one embodiment of the present disclosure, a breeze power generation device for use in an urban environment is provided. Figure 1-3 These are the front view, right view and top view of the breeze power generation device, such as Figure 1-3 As shown, the breeze power generation device includes a lightweight vertical axis wind impeller 1-3, connecting rods 4-9, a transmission shaft 10, and a physical protective cover 11; Figure 4-6 It is the front view, right view and top view of the physical protective cover, such as Figure 4-6 As shown, the electrical parts inside the physical protective cover are: hybrid excitation generator 12, rectifier 13, controller 14, energy storage device 15, connecting rods 16-23. Each part is described below:

[0056] 1. Vertical axis wind turbine 1-3

[0057] Structure such as Figure 7 As shown in the figure, the wind speed in the urban environment is relatively low. At the same time, it is affected by the urban traffic environment, and the wind speed changes greatly and the frequency is high, resulting in low wind energy quality. Compared with the horizontal axis impeller, this impeller is more adaptable to wind changes and can capture wind energy efficiently.

[0058] The impeller material is made of bast fiber from the natural fast-growing plant flax. This material has low fiber density, high strength and modulus, ensuring the lightweight of the device. At the same time, the material is widely available and renewable, has no pollution during processing, is easy to handle, is green and environmentally friendly, and is suitable for urban environments.

[0059] 2. Controller 14

[0060] The controller 14 is mainly used to execute the control method of the breeze power generation device for urban environment described in the second embodiment, and includes an internal control unit and an external interaction unit:

[0061] (1) The internal control unit controls the energy storage device and the generator to achieve a stable voltage output from the generator. Specifically:

[0062] During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device;

[0063] When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage.

[0064] The electric energy generated by the power generation device is stored in the energy storage device 15 by default. In this embodiment, the normal operation of the power generation device requires internal electric energy support. This part of the electric energy is generated by itself, that is, provided by the energy storage device. The electric energy required inside the power generation device includes the electric energy required by the controller and the electric energy required for the electric excitation of the hybrid excitation generator, and no external energy access is required.

[0065] The electric energy required by the controller is used to support the controller to control the energy storage device and the generator, so that the power generation device can output a stable voltage to the outside. When there is no electric energy provided, it will not hinder the generator from generating electric energy.

[0066] The electric energy required for the electric excitation of the hybrid excitation generator is used to regulate the output voltage stability. When there is no electric energy available, the hybrid excitation motor uses permanent magnets to generate a magnetic field to generate electricity and does not require electric energy support.

[0067] This self-powered mode does not require external energy access, reduces the requirements and impact on the external environment during installation, and is highly environmentally friendly.

[0068] (2) The user can start and stop the device and modify the internal control of the controller through the external interaction unit. The operation of modifying the internal control of the controller is to set the internal parameters of the controller, such as the output voltage fixed value and the output requirements of the energy storage device.

[0069] 3. Hybrid excitation generator 12: adopt Figure 8 The direct drive hybrid excitation wind turbine shown

[0070] In the direct-drive structure, the rotating shaft of the wind turbine is connected to the transmission shaft, and the wind impeller is connected to the transmission shaft through a connecting rod, eliminating the need for a gear transmission device, making the system more compact and lightweight, and facilitating installation and layout in urban environments.

[0071] The generator adopts hybrid excitation technology. The generator magnetic field is generated by permanent magnets and excitation current. By controlling the electric excitation method, the output voltage of the generator after rectification is stabilized at a constant value.

[0072] Currently, the maximum wind speed variation of a single wind farm generator on the market is 18%. In this embodiment, due to the special application scenario, the instantaneous wind speed fluctuation of the generator in the urban breeze environment is large. Therefore, the design of the hybrid permanent magnet synchronous motor takes into account the maximum wind speed variation of 25%. The ratio of hybrid excitation is determined to be 4 to 1 between permanent magnet excitation and electric excitation, that is, the magnetic field generated by the permanent magnet in the hybrid excitation generator is T rated , the motor magnetic field can be increased to 1.25T through electric excitation rated Or reduce to 0.75T rated When the generator is running at rated wind speed, the magnetic field is entirely provided by permanent magnets. At low and high wind speeds, the magnetic field is generated by permanent magnets and excitation current to ensure that the output voltage after rectification remains at a stable value.

[0073] The motor magnetic field of a traditional electromagnetic motor or a permanent magnet motor is provided solely by the electromagnetic field or the permanent magnet magnetic field, while the motor magnetic field of a hybrid excitation motor is generated by both permanent magnet excitation and electromagnetic excitation.

[0074] At rated wind speed, the motor magnetic field is completely generated by permanent magnets, and the magnetic field generated by permanent magnets is T rated When the wind speed changes, the motor magnetic field is generated by the permanent magnet and the electric excitation. According to the wind speed fluctuation, the electric excitation increases the motor magnetic field to 1.25T. rated Or reduce to 0.75T rated When the wind speed decreases, the controller controls the energy storage device to output a gain current for the generator excitation, generating a magnetic field identical to the generator's and strengthening the overall magnetic field of the motor. When the wind speed increases, the controller controls the energy storage device to output a loss current for the generator excitation, generating a magnetic field opposite to the generator's and reducing the overall magnetic field of the motor to meet the 25% wind speed change requirement.

[0075] 4. Transmission shaft 10:

[0076] One end of the transmission shaft 10 is connected to the vertical axis wind impeller 1-3, and the other end is connected to the hybrid excitation generator 12, which transmits the wind energy captured by the vertical axis wind impeller 1-3 to the hybrid excitation generator 12, eliminating the gear box structure and making the overall power generation device more compact and lightweight.

[0077] 5. Rectifier 13

[0078] The rectifier 13 converts the alternating current output by the hybrid excitation generator 12 into stable and high-quality direct current through AC / DC, DC / AC, and AC / DC conversions.

[0079] 6. Energy storage device 15

[0080] The energy storage device 15 stores and outputs electric energy under the control of the controller 14 , and the control method is as described in the controller part.

[0081] 7. Physical protection shield 11

[0082] The physical protective cover 11 is used to protect the electrical parts in the device from external environmental influences, extend the system life, and improve the system operation safety; except for the power output and the interaction between the external interactive unit of the controller and the outside world, it can completely isolate the external environmental influences, reduce damage to the urban environment, and improve its own safety and life.

[0083] The electrical connections and control logic inside the physical protection cover 11 are as follows: Figure 9 As shown in the figure, the electric energy generated by the hybrid excitation motor is output to the rectifier and then divided into three lines after rectification:

[0084] Line 1: Input to the controller, where the controller controls the energy output device and the coordinated operation of the system.

[0085] Line 2: Input energy storage device, which stores and outputs electric energy under the control of the controller.

[0086] Line 3: Under the control of the controller, it outputs electrical energy to the external load.

[0087] 8. Connecting rods 4-9, 16-23: used to connect different units, specifically:

[0088] Connecting rods 4-6 connect the vertical axis wind impeller and the transmission shaft;

[0089] Connecting rods 5-7 connect the vertical axis wind impeller and the transmission shaft;

[0090] Connecting rods 8-9 connect the vertical axis wind impeller and the transmission shaft;

[0091] Connecting rods 16 and 20 connect the hybrid excitation generator and the inner wall of the physical protection cover;

[0092] Connecting rods 17 and 21 connect the rectifier to the inner wall of the physical protection cover;

[0093] Connecting rods 18 and 22 connect the control unit inside the controller and the inner wall of the physical protective cover;

[0094] Connecting rods 19 and 23 connect the energy storage device and the inner wall of the physical protection cover.

[0095] The main advantages of the above-mentioned breeze power generation device for urban environment are:

[0096] 1) Efficient use of wind energy:

[0097] In urban breeze environments, the wind speed is low, the wind speed fluctuations are large and the frequency is high. Traditional horizontal axis wind turbines have high requirements for wind energy and are difficult to apply.

[0098] Vertical-axis wind turbines have a higher utilization rate of low-wind-speed wind energy and are more adaptable to wind speed changes, which can effectively realize the high-quality conversion of urban breeze wind energy into electrical energy; at the same time, it helps to enhance the starting capability of power generation equipment in a breeze environment.

[0099] 2) Low cost, lightweight, and strong applicability in low wind speed environments:

[0100] Traditional wind turbine impeller materials not only have high production costs, but are also prone to producing harmful substances when used in urban environments for a long time, resulting in high subsequent maintenance costs.

[0101] The wind turbine designed in this embodiment has a vertical axis structure and is made of bast fiber from the natural fast-growing plant flax. The fiber has a low density and high strength and modulus, which reduces costs while ensuring structural strength for use in urban breeze environments.

[0102] 3) Lightweight:

[0103] The wind turbine impeller is made of bast fiber from the natural fast-growing plant flax. The low-density material makes the blades very lightweight. The power generation device adopts a direct-drive structure, which makes the overall transmission structure of the device simple and compact. The design of the two makes the device highly lightweight, making it easy to install on various devices in multiple urban scenarios.

[0104] 4)Stable output voltage:

[0105] The urban wind environment is greatly affected by the urban traffic environment, and the wind energy quality is poor, with the characteristics of low wind speed, large wind speed variation, and frequent wind speed changes. This embodiment can use the controller to control the hybrid excitation generator and energy storage device in low wind speed environments or environments with large wind speed fluctuations to maintain the output voltage of the rectifier at a fixed value. It can be installed separately to provide high-quality electricity to the load; or it can be installed on a large scale and connected to the grid to input a large amount of energy without causing grid fluctuations.

[0106] 5) Self-powered and environmentally friendly:

[0107] The power generation system generates all the required electrical energy by itself, including the energy required by the controller and the energy required for the electric excitation of the hybrid excitation generator. No external energy source is required, which reduces the impact on the external environment during installation.

[0108] 6) Strong applicability and safety in urban breeze environment:

[0109] The physical protective cover can effectively isolate the electrical part. In addition to supplying energy to the outside, the device as a whole does not need to interact with the external environment, which makes the device have extremely low requirements for the installation environment and application environment. The device can isolate the impact of severe weather such as urban wind, frost, rain, snow, sand and gravel, as well as the complex traffic environment on its application. In addition, the overall lightweight design allows it to be installed and used in various urban scenarios.

[0110] Example 2

[0111] In one embodiment of the present disclosure, a control method for a breeze power generation device for an urban environment is provided, comprising:

[0112] During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device;

[0113] When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage.

[0114] The following describes in detail the implementation process of a control method for a breeze power generation device used in an urban environment according to this embodiment.

[0115] This embodiment provides a control method for a breeze power generation device for an urban environment, which controls the power generation device from startup to the generator being able to output a stable voltage. The control here is to control the breeze power generation device to perform different actions, which is divided into a startup phase and a normal operating wind speed change phase.

[0116] 1. Control during startup of power generation device

[0117] (1) When the power generation device is started at a wind speed lower than the rated speed, if there is no remaining electric energy in the energy storage device when the power generation device was shut down last time or the remaining electric energy does not meet the output requirements, the energy storage device is controlled in real time to store electric energy and not output electric energy to the outside; at this time, the power generation device does not supply energy to the outside.

[0118] The output requirement here is based on different application scenarios (such as urban traffic sections, urban residential areas, urban fringe areas, etc.). The user sets the remaining power threshold of the energy storage device. When the remaining power of the energy storage device is not less than the remaining power threshold, the energy storage device meets the requirement of outputting electric energy. For example, the full charge of the energy storage device is 100, and the output requirement is set to 50. When the remaining power is not less than 50, the energy storage device starts to output electric energy to ensure that the power generation device can stably provide the electric energy required for the electric excitation of the hybrid excitation generator when operating at low wind speed for a long time.

[0119] After charging to meet the requirements for external power output, the energy storage device stops storing power and outputs power to the outside, while the power generation device starts to output stable power to the outside; if the remaining power of the power generation device last time meets the output requirements, the energy storage device is controlled in real time to stop storing power and output power to the outside, and the power generation device outputs power to the outside.

[0120] (2) When the power generation device is started at the rated wind speed, the energy storage device is controlled in real time to store electric energy. At the same time, the energy storage device does not output electric energy to the outside, and the power generation device outputs electric energy to the outside.

[0121] (3) When the power generation device is started at a wind speed higher than the rated wind speed, the energy storage device is controlled in real time to store electric energy, while the energy storage device and the power generation device output electric energy to the outside.

[0122] 2. Control of wind speed changes under normal operation of the power generation device

[0123] When the wind speed fluctuates, the following controls are performed based on the real-time fluctuation of the wind speed:

[0124] (1) When the power generation device operates at a lower wind speed, the energy storage device is controlled in real time to stop storing electrical energy and output electrical energy to the outside, while the power generation device outputs electrical energy to the outside.

[0125] When the low wind speed operation time is long, the energy stored in the energy storage device does not meet the operating requirements, the power generation device stops outputting electricity to the outside, and controls the energy storage device to start charging, that is, storing electricity. After the energy storage device is charged until it meets the requirements for outputting electricity to the outside, the energy storage device stops storing electricity and outputs electricity to the outside, while the power generation device outputs electricity to the outside.

[0126] (2) When the power generation device operates at the rated wind speed, the energy storage device is controlled in real time to store electrical energy. After the electrical energy generated by the generator is rectified by the rectifier, a portion is input into the energy storage device for electrical energy storage; a portion is input into the controller as electrical energy used by the controller; and a portion is output externally. Among them, the electrical energy input into the energy storage device accounts for 10% of the electrical energy generated by the generator, the electrical energy used by the controller accounts for 5% of the electrical energy generated by the generator, and the electrical energy output externally accounts for 85% of the electrical energy generated by the generator. At the same time, the energy storage device does not output electrical energy externally.

[0127] When the energy storage device that works at the rated wind speed for a long time is charged to the saturation state (i.e. the energy storage device is fully charged), charging stops. At this time, the electric energy generated by the generator is rectified by the rectifier, and a portion is input into the controller as the electric energy used by the controller; and a portion is output to the outside; among them, the electric energy used by the controller accounts for 5% of the electric energy generated by the generator, and the electric energy output to the outside accounts for 95% of the electric energy generated by the generator.

[0128] (3) When the power generation device operates at a wind speed higher than the rated wind speed, the energy storage device is controlled in real time to store electric energy. After the electric energy generated by the generator is rectified by the rectifier, a portion is input into the energy storage device for electric energy storage according to a proportion, a portion is input into the controller as the electric energy used by the controller, and a portion is output to the outside; among them, the electric energy input into the energy storage device accounts for 10% of the electric energy generated by the generator, the electric energy used by the controller accounts for 5% of the electric energy generated by the generator, and the electric energy output accounts for 85% of the electric energy generated by the generator.

[0129] When the energy storage device that has been working for a long time at a wind speed higher than the rated speed is charged to a saturated state, charging stops (when the power generation device is working at a wind speed higher than the rated speed, the input power of the energy storage device is greater than the output power). At this time, the power generated by the generator is rectified by the rectifier, and a portion is input into the controller as the power used by the controller; and a portion is output to the outside; among them, the power used by the controller accounts for 5% of the power generated by the generator, and the power output accounts for 95% of the power generated by the generator.

[0130] When the wind speed drops below the rated wind speed, the energy storage device outputs electrical energy to the outside, and when it is discharged to the secondary charging index, the energy storage device is recharged.

[0131] The secondary charge indicator is the remaining energy threshold at which the energy storage device, after being fully charged, can discharge to the point where it can be recharged. For example, if the secondary charge indicator is set to 70, the remaining energy when the energy storage device is fully charged is 100. When the remaining energy reaches 70, the energy storage device will restart charging. At the same time, the secondary charge requirement must be greater than the output requirement of the energy storage device.

[0132] If the energy storage device reaches the secondary charging index, the power generation device operates at a state lower than the rated wind speed. The energy storage device will not charge at this time until the energy storage device's electric energy does not meet the external output requirements. The power generation device stops outputting electric energy and controls the energy storage device to start charging, that is, storing electric energy. After charging until the energy storage device meets the external electric energy output requirements, the energy storage device stops storing electric energy and outputs electric energy to the outside. At the same time, the power generation device outputs electric energy to the outside.

[0133] If the energy storage device reaches the secondary charging index and the power generation device operates at the rated wind speed, the energy storage device starts to charge.

[0134] If the energy storage device reaches the secondary charging index and the power generation device operates at a wind speed higher than the rated wind speed, the energy storage device starts to charge.

[0135] In the above process, a fixed voltage control method is also used to control the output voltage of the hybrid generator after rectification to be stable at a fixed value, ensuring the stability of the output voltage under all wind speed conditions; the fixed value here is a custom value, which can be given according to the application scenario and set through the controller's external interaction unit.

[0136] Specifically, the rectified output voltage of the generator is used as the control signal for the electric excitation control of the hybrid excitation generator. By monitoring the changes in the rectified output voltage in real time, the electric excitation of the hybrid excitation generator is adjusted to keep the output voltage stable at a fixed value, ensuring that the system can stably supply power to the load in an urban breeze environment with large wind speed fluctuations and high frequency. When the wind speed fluctuates, the following control is performed according to the real-time fluctuation of the wind speed:

[0137] (1) At rated wind speed, the output of the energy storage device is turned off, and the magnetic field required by the generator is provided by the permanent magnets of the hybrid excitation generator.

[0138] (2) When the wind speed is higher than the rated speed, the energy storage device is controlled to output the excitation current to act on the generator, generating a magnetic field opposite to the permanent magnet through electric excitation, reducing the output voltage of the hybrid excitation wind turbine to prevent damage to the rectifier, while keeping the output voltage at a fixed value.

[0139] (3) When the wind speed is lower than the rated speed, the energy storage device is controlled to output the excitation current to act on the generator, and a magnetic field opposite to the permanent magnet is generated through electric excitation, thereby increasing the output voltage of the generator, ensuring that the rectifier will not be shut down due to low voltage, and ensuring the stable voltage output of the device.

[0140] (4) When the power generation device is started at a wind speed lower than the rated speed for a long time and the energy storage device cannot meet the power output requirements, the energy storage device is controlled in real time to store power and not output power to the outside; at this time, the power generation device does not supply power to the outside; after charging to meet the power output requirements, the energy storage device stops storing power and outputs power to the outside; at the same time, the power generation device starts to output stable power to the outside.

[0141] When the power generation device is shut down, at any wind speed, it first stops supplying power to the outside, brakes the generator to stop generating electricity, and stores the electrical energy inside the energy storage device for next use.

[0142] Example 3

[0143] The purpose of this embodiment is to provide a computer-readable storage medium.

[0144] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a control method for a breeze power generation device for an urban environment as described in the second embodiment of the present disclosure.

[0145] Example 4

[0146] The purpose of this embodiment is to provide an electronic device.

[0147] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of a control method for a micro-wind power generation device for an urban environment as described in the second embodiment of the present disclosure are implemented.

[0148] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A breeze power generation device for urban environment, characterized in that: Including wind turbine, hybrid excitation generator and energy storage device: The hybrid excitation generator is a direct-drive hybrid excitation wind turbine generator that uses hybrid excitation technology. The generator magnetic field is generated by permanent magnets and excitation current. By controlling the electric excitation mode, the voltage output by the generator after rectification is stabilized at a constant value. A group of wind turbines are evenly and unidirectionally arranged around the transmission shaft to capture wind energy; a hybrid excitation generator connected to the wind turbines via the transmission shaft is used to convert wind energy into electrical energy; an energy storage device is connected to the hybrid excitation generator via a rectifier to store and output electrical energy; During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device; When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage; Place the hybrid excitation generator and energy storage device within a physical protective enclosure.

2. A breeze power generation device for urban environment according to claim 1, characterized in that: The wind impeller is a vertical axis wind impeller, and is made of bast fiber of natural fast-growing plant flax.

3. A control method for a breeze power generation device in an urban environment, characterized in that: During the operation of the breeze power generation device, according to the preset rated wind speed and the remaining power of the energy storage device, the breeze power generation device is controlled to perform different actions: outputting power to the outside and storing power in the energy storage device; When the wind speed changes, the energy storage device provides electrical energy to the hybrid excitation generator to adjust the electrical excitation of the hybrid excitation generator and maintain the stability of the output voltage; The hybrid excitation generator is a direct-drive hybrid excitation wind turbine generator that uses hybrid excitation technology. The generator magnetic field is generated by permanent magnets and excitation current. By controlling the electric excitation mode, the voltage output by the generator after rectification is stabilized at a constant value. Place the hybrid excitation generator and energy storage device within a physical protective enclosure.

4. The control method for a breeze power generation device for an urban environment according to claim 3, characterized in that: The control of the breeze power generation device to perform different actions is divided into a startup phase and a normal working wind speed change phase.

5. The control method for a breeze power generation device for an urban environment according to claim 4, characterized in that: During the startup phase, the energy storage device is preferentially controlled to store electric energy until the demand for outputting electric energy is met, at which time the energy storage device stops storing electric energy and the power generation device starts outputting electric energy.

6. The control method for a breeze power generation device for an urban environment according to claim 5, characterized in that: The requirements for outputting electrical energy are specifically: The residual electric energy of the energy storage device can ensure that when the power generation device operates at a low wind speed for a long time, it can stably provide the electric energy required for the electric excitation of the hybrid excitation generator.

7. The control method for a breeze power generation device for an urban environment according to claim 5, characterized in that: The normal working wind speed change stage is to adjust the control strategy in real time according to the wind speed fluctuation, specifically: When the wind speed is lower than the rated speed, the energy storage device stops storing electricity and outputs electricity to the outside, while the power generation device outputs electricity to the outside; At rated wind speed, the energy storage device stores electrical energy, the power generation device outputs electrical energy, and the energy storage device does not output electrical energy. When the wind speed is higher than the rated speed, the energy storage device stores electrical energy, the power generation device outputs electrical energy to the outside, and the energy storage device outputs electrical energy to the outside at the same time.

8. The control method for a breeze power generation device for an urban environment according to claim 3, characterized in that: The adjusting of the electric excitation of the hybrid excitation generator is specifically as follows: At rated wind speed, the motor magnetic field is entirely generated by permanent magnets; When the wind speed changes, the motor magnetic field is generated by the permanent magnet and the electric excitation, and the motor magnetic field is adjusted according to the wind speed fluctuation; When the wind speed decreases, the energy storage device outputs a gain current for the generator excitation, generating a magnetic field identical to the generator magnetic field and enhancing the overall magnetic field of the motor; When the wind speed increases, the energy storage device outputs a reduction current for generator excitation, generating a magnetic field opposite to the generator magnetic field and reducing the overall magnetic field of the motor.

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