Independent micro-grid control system, method and terminal for wind turbine generator

Abstract

The invention provides an independent micro-grid control system, method and terminal for a wind turbine generator, and the system comprises a wind turbine generator master control system; the back-up power supply controller is in communication connection with the wind turbine generator master control system, and the back-up power supply controller is in electric signal connection with the back-up power supply storage battery pack; a micro fan and a micro fan controller, the WeChat fan controller is in communication connection with the back-up power supply controller, and the micro fan controller is in electric signal connection with the micro fan; the photovoltaic inverter is in communication connection with the back-up power supply controller, and the photovoltaic inverter is in electric signal connection with the photovoltaic generator set. The technical problems that in the prior art, the electric quantity of an existing back-up power source mostly depends on ship electricity and a power grid for charging, limitation exists in an island mode, and the continuous electric quantity requirement of the back-up power source cannot be guaranteed are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power equipment, and in particular to an independent microgrid control system, method and terminal for a wind turbine set. Background Art

[0002] As an important component of renewable energy, wind turbines are unable to continuously cope with special operating conditions such as typhoon resistance, flutter resistance, and vortex-induced vibration resistance in island mode due to the special operating environment. They lack real-time monitoring and control capabilities, which affects the safety and reliability of the units.

[0003] Especially when the wind farm is being hoisted and the cables have not been laid normally, the submarine cables are under maintenance, or there is a power grid failure, offshore wind turbines need to withstand extreme wind loads, which places higher demands on the design cost and reliability of the units. In order to reduce the design cost of the unit and improve the ability to cope with special working conditions, designing energy storage backup power supplies for the units has become a common solution. However, most of the existing backup power supplies rely on ship power and power grid charging, which has limitations in island mode and cannot guarantee the continuous power demand of the backup power supply. In addition, the existing offshore wind turbines lack remote real-time and comprehensive monitoring and control capabilities in island mode, which makes it impossible to get timely feedback and processing of the operating conditions of the units under special working conditions, further increasing the risk of unit operation.

[0004] In view of this, the inventor proposes a wind turbine independent microgrid control system, method and terminal. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes an independent microgrid control system, method and terminal for a wind turbine to solve the technical problem that the existing backup power supply in the prior art mostly relies on ship power and power grid for charging, which has limitations in island mode and cannot guarantee the continuous power demand of the backup power supply.

[0006] In a first aspect, the present invention first proposes an independent microgrid control system for a wind turbine generator set, comprising:

[0007] Wind turbine main control system;

[0008] A backup power supply battery pack and a backup power supply controller, wherein the backup power supply controller is communicatively connected to the main control system of the wind turbine generator set, and the backup power supply controller is electrically signal-connected to the backup power supply battery pack;

[0009] A micro fan and a micro fan controller, wherein the micro fan controller is communicatively connected to the backup power supply controller, and the micro fan controller is electrically signal connected to the micro fan; and

[0010] A photovoltaic power generation group and a photovoltaic inverter, wherein the photovoltaic inverter is communicatively connected to the backup power supply controller, and the photovoltaic inverter is electrically signal connected to the photovoltaic power generation group.

[0011] Furthermore, the photovoltaic power generation group includes a photovoltaic panel and a panel controller, and the panel controller is communicatively connected to the backup power supply controller.

[0012] Furthermore, the micro fan adopts a small horizontal axis wind turbine with a power of 10 kW, and the micro fan is used to directly charge the backup power supply.

[0013] Furthermore, it also includes a Beidou system, which includes a monitoring center server, a Beidou short message data terminal device, a Beidou client and a Beidou satellite. The Beidou client uses an RS485 bus interface to connect to a backup power supply controller and a monitoring center server.

[0014] Furthermore, it also includes a SCADA server module, which is connected to the wind turbine main control system via Ethernet, and is used to collect real-time data of the wind turbine operation.

[0015] In a second aspect, the present invention provides a method for controlling an independent microgrid of a wind turbine generator set. The method is implemented by using the independent microgrid control system of the wind turbine generator set described in the first aspect, and includes:

[0016] When the wind turbine generator set enters the off-grid operation state and the backup power supply battery pack is started to supply power to the load equipment of the wind turbine generator set, the battery capacity data of the backup power supply battery pack is obtained;

[0017] The power of the backup power battery group is compared with the first power protection threshold according to the battery capacity data. If the power of the backup power battery group is less than the first power protection threshold, the temperature data and the ambient wind speed data of the wind turbine group are obtained;

[0018] Photovoltaic generator sets and / or micro wind turbine generator sets are used to charge the backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data.

[0019] Furthermore, a photovoltaic generator set and / or a micro wind turbine generator set is used to charge a backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data, including:

[0020] If the temperature data of the wind turbine generator set is greater than the temperature setting threshold and the ambient wind speed data is less than the first wind speed setting threshold, the photovoltaic generator set is used to charge the backup power supply battery pack until the power of the backup power supply battery pack reaches the second power protection threshold.

[0021] Furthermore, a photovoltaic generator set and / or a micro wind turbine generator set is used to charge a backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data, including:

[0022] If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is greater than the second wind speed setting threshold, the micro-generator set is used to charge the backup power battery pack until the power of the backup power battery pack reaches the second power protection threshold.

[0023] Further, the photovoltaic generator set and / or the micro wind turbine generator set are used to charge the backup power supply battery set according to the wind turbine set temperature data and the ambient wind speed data, including:

[0024] If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is less than the second wind speed setting threshold, the micro generator set and the photovoltaic generator set are used to charge the backup power battery pack simultaneously until the power of the backup power battery pack reaches the second power protection threshold.

[0025] In a third aspect, the present invention proposes a terminal comprising a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the independent microgrid control method for a wind turbine set proposed in the second aspect.

[0026] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows:

[0027] The present invention proposes an independent microgrid control system, method and terminal for wind turbines, wherein the system realizes the uninterrupted operation of offshore wind turbines in an island mode such as a grid-offline state or a power outage due to a fault through the integrated application of a micro wind turbine, a photovoltaic system, a Beidou satellite system, an energy storage backup power supply device and a main control system. First, the micro wind turbine and the photovoltaic system are used to provide continuous power for the energy storage backup power supply, which solves the problem of insufficient power and limited endurance of the backup power supply, and reduces the design cost of the unit energy storage equipment. Secondly, remote monitoring and control are realized through the Beidou satellite system, and the main control system is combined to intelligently execute control strategies such as anti-typhoon, anti-flutter, and anti-vortex excitation, ensuring that the unit can maintain a normal and controllable operating state under any extreme working conditions. In addition, the method also realizes real-time monitoring of the operating status of the unit, improves the safety and reliability of the unit, and solves the technical problem that the existing backup power supply in the prior art mostly relies on ship power and power grid for charging, which has limitations in the island mode and cannot guarantee the continuous power demand of the backup power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 A schematic diagram of the overall structure of an independent microgrid control system for a wind turbine generator system according to an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the overall control flow provided by a method for controlling an independent microgrid of a wind turbine generator system according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a circuit structure including a ring network is provided for an independent microgrid control system of a wind turbine generator set according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0033] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0034] In order to solve the technical problem that the existing backup power supply in the prior art mostly relies on ship power and power grid for charging, which has limitations in the island mode and cannot guarantee the continuous power demand of the backup power supply, such as Figure 1 As shown, in the first aspect, this embodiment provides an independent microgrid control system for a wind turbine generator set, including:

[0035] Wind turbine main control system;

[0036] A backup power supply battery pack and a backup power supply controller, wherein the backup power supply controller is communicatively connected to the main control system of the wind turbine generator set, and the backup power supply controller is electrically signal-connected to the backup power supply battery pack;

[0037] A micro fan and a micro fan controller, the micro fan controller is communicatively connected with the backup power supply controller, the micro fan controller is electrically connected with the micro fan, and the present embodiment is preferred, the micro fan adopts a small horizontal axis wind turbine with a power of 10kw, and the micro fan is used to directly charge the backup power supply. The present embodiment is preferred, the installation position of the micro fan is on the column of the tower base platform of the offshore wind turbine unit, and the small wind turbine is mainly used to charge the backup power supply battery to realize the function of continuing the energy of the backup power supply. The output of the small fan in this embodiment is connected to the AC side of the backup power supply through a cable, that is, the small fan controller controls the output electric energy within the charging range of the backup power supply battery to realize the charging function, and can directly output electric energy through the controller to power other devices of the backup power supply.

[0038] A photovoltaic generator set and a photovoltaic inverter, the photovoltaic inverter is communicatively connected to the backup power supply controller, the photovoltaic inverter is electrically signal-connected to the photovoltaic generator set. As a preferred solution of this embodiment, the photovoltaic generator set includes a photovoltaic panel and a panel controller, the panel controller is communicatively connected to the backup power supply controller. Specifically, the photovoltaic panel uses polycrystalline silicon component solar cells, and the area and capacity of the photovoltaic components are configured according to the unit load and the backup power supply power and capacity. In addition, the photovoltaic system is installed on the tower base platform of the offshore wind turbine set, mainly utilizing the photovoltaic panel to output electrical energy to control the DC side of the backup power supply battery, thereby realizing the function of continuing the backup power supply, and controlling the power supply by detecting the bus voltage of the backup power supply battery. The monitoring of the bus voltage is divided into signal and communication dual redundant modes to improve the stability and accuracy of the control.

[0039] This embodiment preferably also includes a Beidou system, which includes a monitoring center server, a Beidou short message data terminal device, a Beidou client and a Beidou satellite. The Beidou client is connected to the backup power supply controller and the monitoring center server using an RS485 bus interface. The Beidou system communication realizes data transmission between the backup power supply and the control service platform through the Beidou client and the Beidou satellite, realizes point-to-surface data interaction between the monitoring center control terminal and the backup power supply, realizes backup power supply status monitoring and start-stop control, and ensures the safety of off-grid operation of wind turbines. The wind turbine status data is interacted to provide a status basis for off-grid mode control of the unit.

[0040] This embodiment preferably also includes a remote monitoring App client, which is connected to the backup power supply controller through the Beidou system via serial port communication to achieve the function of remotely controlling the operation of the backup power supply. The operator uses the remote monitoring App client to operate the backup power supply in real time.

[0041] In addition, in this embodiment, preferably, the circuit diagram of the wind turbine system is as follows: Figure 3As shown, the wind turbine generator set includes a ring network cabinet, a transformer cabinet, a converter cabinet, a cabin system and a tower base system. The independent microgrid control system of the wind turbine generator set proposed in this embodiment is used to provide backup power supply to the above-mentioned cabin system and tower base system. Furthermore, the wind turbine generator set is connected to the backup power supply AC side circuit through a cable, and the photovoltaic system is connected to the backup power supply DC side through a cable. The main function is to continue the backup power supply and supply power to the DC load and equipment of the unit. The backup power supply is connected to the wind turbine generator set through a 400V cable, mainly to provide power support for the unit.

[0042] That is, this embodiment proposes an independent microgrid control system for a wind turbine, wherein, through the integrated application of a micro wind turbine, a photovoltaic system, a Beidou satellite system, an energy storage backup power supply device and a main control system, the uninterrupted operation of an offshore wind turbine in an island mode such as a grid disconnection state or a fault power outage is realized. First, the micro wind turbine and the photovoltaic system are used to provide continuous power for the energy storage backup power supply, which solves the problem of insufficient power and limited endurance of the backup power supply, and reduces the design cost of the unit energy storage equipment. Secondly, remote monitoring and control are realized through the Beidou satellite system, and the main control system is combined to intelligently execute control strategies such as anti-typhoon, anti-flutter, and anti-vortex excitation, ensuring that the unit can maintain a normal and controllable operating state under any extreme working conditions. In addition, the method also realizes real-time monitoring of the operating status of the unit, improves the safety and reliability of the unit, and solves the technical problem that the existing backup power supply in the prior art mostly relies on ship power and power grid for charging, which has limitations in the island mode and cannot guarantee the continuous power demand of the backup power supply.

[0043] On the second aspect, this embodiment also provides a method for controlling an independent microgrid of a wind turbine. It should be noted that the photovoltaic system and the micro wind turbine generator set provide power support for the backup power supply and the load equipment of the unit in a DC / AC manner, respectively, to form power supply equipment for independent microgrid operation. This embodiment implements communication support for the operation of the wind turbine microgrid through the main control and Beidou system, thereby controlling the wind power to automatically execute the control strategy under various working conditions, so as to realize that the unit has electricity when it needs it, such as Figure 2 As shown, including:

[0044] S1. When the wind turbine generator set enters the off-grid operation state and the backup power supply battery pack is started to supply power to the wind turbine generator set load equipment, the battery capacity data of the backup power supply battery pack is obtained, that is, when the wind turbine generator set load equipment enters the off-grid operation state, the backup power supply is used to supply power to the wind turbine generator set load equipment first, and the real-time status of the power in the backup power supply battery pack is monitored at the same time.

[0045] S2. Compare the power of the backup power battery pack with the first power protection threshold according to the battery capacity data. If the power of the backup power battery pack is less than the first power protection threshold, obtain the temperature data and ambient wind speed data of the wind turbine generator set;

[0046] S3, using photovoltaic generators and / or micro wind turbine generators to charge the backup power battery pack according to the wind turbine temperature data and ambient wind speed data; thus, the temperature and wind speed data are obtained in real time through the wind turbine main control system, and the charging mode of the backup power battery pack with the best adaptability is determined in real time based on these data. This embodiment is preferred, and includes three charging modes for the power battery pack, which are a first charging mode for charging the backup power battery pack using a photovoltaic generator, a second charging mode for charging the backup power battery pack using a micro wind turbine generator, and a third charging mode for charging the power battery pack using both the micro wind turbine generator and the photovoltaic generator. This embodiment is preferred. Specifically, the control process of the first charging mode is as follows:

[0047] If the temperature data of the wind turbine generator set is greater than the temperature setting threshold and the ambient wind speed data is less than the first wind speed setting threshold, the photovoltaic generator set is used to charge the backup power supply battery pack until the power of the backup power supply battery pack reaches the second power protection threshold.

[0048] In this embodiment, the control process of the second charging mode is preferably as follows:

[0049] If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is greater than the second wind speed setting threshold, the micro-generator set is used to charge the backup power battery pack until the power of the backup power battery pack reaches the second power protection threshold.

[0050] In this embodiment, the control process of the third charging mode is as follows:

[0051] If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is less than the second wind speed setting threshold, the backup power supply battery set is charged simultaneously by the micro generator set and the photovoltaic generator set until the power of the backup power supply battery set reaches the second power protection threshold. The above three different charging modes can meet the real-time monitoring of the temperature data of the wind turbine set and the different conditions of the environmental wind speed data, and the backup power supply battery set is charged in real time to supply energy to the battery set, so as to achieve stable operation of the wind turbine load equipment in the off-grid operation state. In addition, by setting the first power protection threshold and the second power protection threshold, when the battery power is lower than the first power protection threshold, the backup power supply battery set can be charged in time to avoid the situation where the battery power is too low and may cause insufficient power supply to the wind turbine set. At the same time, the second power protection threshold is set, so that by setting the charging power upper limit for the battery set, it is ensured that the power in the battery will not be oversaturated due to uninterrupted charging in the charging mode, so that the battery set is in a charging state for a long time and damages the battery health, so as to provide sufficient and stable power supply to the wind turbine load equipment, which is highly practical.

[0052] In a third aspect, this embodiment provides a terminal, comprising a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the independent microgrid control method for a wind turbine group as described in the second aspect.

[0053] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical or other forms.

[0056] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0057] In addition, the functional units in the various embodiments of the application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software program modules.

[0058] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program codes.

[0059] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which can include: a flash drive, a read-only memory, a random access memory, a magnetic disk or an optical disk, etc.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wind turbine independent microgrid control system, characterized in that: include: Wind turbine main control system; A backup power supply battery pack and a backup power supply controller, wherein the backup power supply controller is communicatively connected to the main control system of the wind turbine generator set, and the backup power supply controller is electrically signal-connected to the backup power supply battery pack; A micro fan and a micro fan controller, wherein the micro fan controller is communicatively connected to the backup power supply controller, and the micro fan controller is electrically signal connected to the micro fan; and A photovoltaic power generation group and a photovoltaic inverter, wherein the photovoltaic inverter is communicatively connected to the backup power supply controller, and the photovoltaic inverter is electrically signal connected to the photovoltaic power generation group.

2. The independent microgrid control system for wind turbine generator set according to claim 1 is characterized in that: The photovoltaic power generation group includes a photovoltaic panel and a panel controller, and the panel controller is communicatively connected with the backup power supply controller.

3. The independent microgrid control system for wind turbine generator set according to claim 1 is characterized in that: The micro fan adopts a small horizontal axis wind turbine with a power of 10 kW, and the micro fan is used to directly charge the backup power supply.

4. The independent microgrid control system for wind turbine generator set according to claim 1, characterized in that: It also includes a Beidou system, which includes a monitoring center server, a Beidou short message data terminal device, a Beidou client and a Beidou satellite. The Beidou client uses an RS485 bus interface to connect with a backup power supply controller and a monitoring center server.

5. The independent microgrid control system for wind turbine generator set according to claim 1, characterized in that: It also includes a SCADA server module, which is connected to the wind turbine main control system via Ethernet and is used to collect real-time data of the wind turbine operation.

6. A wind turbine independent microgrid control method, characterized in that: The independent microgrid control system of wind turbine generator set according to claims 1 to 4 is implemented, comprising: When the wind turbine generator set enters the off-grid operation state and the backup power supply battery pack is started to supply power to the load equipment of the wind turbine generator set, the battery capacity data of the backup power supply battery pack is obtained; The power of the backup power battery group is compared with the first power protection threshold according to the battery capacity data. If the power of the backup power battery group is less than the first power protection threshold, the temperature data and the ambient wind speed data of the wind turbine group are obtained; Photovoltaic generator sets and / or micro wind turbine generator sets are used to charge the backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data.

7. The independent microgrid control system for wind turbine generator set according to claim 6, characterized in that: The photovoltaic generator set and / or micro wind turbine generator set are used to charge the backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data, including: If the temperature data of the wind turbine generator set is greater than the temperature setting threshold and the ambient wind speed data is less than the first wind speed setting threshold, the photovoltaic generator set is used to charge the backup power battery pack until the power of the backup power battery pack reaches the second power protection threshold.

8. The independent microgrid control system for wind turbine generator set according to claim 6, characterized in that: The photovoltaic generator set and / or micro wind turbine generator set are used to charge the backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data, including: If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is greater than the second wind speed setting threshold, the micro-generator set is used to charge the backup power battery pack until the power of the backup power battery pack reaches the second power protection threshold.

9. The independent microgrid control system for wind turbine generator set according to claim 6, characterized in that: The photovoltaic generator set and / or micro wind turbine generator set are used to charge the backup power supply battery set according to the temperature data of the wind turbine set and the ambient wind speed data, including: If the temperature data of the wind turbine set is greater than the temperature setting threshold and the wind speed data is less than the second wind speed setting threshold, the micro generator set and the photovoltaic generator set are used to charge the backup power battery pack simultaneously until the power of the backup power battery pack reaches the second power protection threshold.

10. A terminal, characterized in that: It includes a processor, an input device, an output device and a memory, which are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the independent microgrid control method for a wind turbine set as described in any one of claims 5 to 9.

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