Wind generating set frequency supporting method, device and equipment and storage medium

Abstract

The invention relates to the technical field of wind power generation, in particular to a wind generating set frequency supporting method, device and equipment and a storage medium. According to the frequency supporting method for the wind generating set, the running state of the wind generating set is detected in real time, when the output active power and the active power required by the load are unbalanced, the output active power is reduced or increased by controlling the rotating speed of the rotor to rapidly store or release kinetic energy, and therefore the unbalance of the active power is reduced, and the frequency supporting effect is improved. And the frequency can be better supported in a short time.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a frequency support method, device, equipment and storage medium for a wind generator set. Background Art

[0002] In the power system, the stability of system frequency is one of the key factors to ensure the quality of power supply. When the system frequency changes, external energy is needed to provide support to restore the system frequency. The traditional view is that due to the uncertainty and volatility of wind energy, wind turbines cannot provide frequency support for the system. However, with the development of power electronics technology and wind power technology, wind power generation has become more and more controllable, and wind turbines have been able to demonstrate frequency regulation capabilities. Therefore, when the output active power and the active power required by the load are unbalanced, how to use wind turbines to provide short-term support for the frequency when the wind speed remains unchanged is a problem that needs to be solved. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is: when the output active power and the active power required by the load are unbalanced, how to use the wind turbine to play a short-term supporting role on the frequency under the condition of constant wind speed.

[0004] In order to solve the above technical problems, the present invention provides a frequency support method for a wind turbine generator set, comprising:

[0005] Monitor the real-time operating status data of wind turbines;

[0006] Perform power imbalance detection according to the real-time operating status data;

[0007] Determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance;

[0008] Real-time control and adjustment of the rotor speed according to the kinetic energy of the rotor adjusted in real time;

[0009] The moment of inertia is adjusted based on real-time feedback of the adjusted rotor speed to ensure that the output power accurately tracks the target power.

[0010] Preferably, the real-time operating status data of the wind turbine generator set to be monitored includes:

[0011] Acquiring real-time operating status data, wherein the real-time operating status data includes real-time output active power, real-time load demand, real-time rotor speed, real-time wind speed, real-time moment of inertia and number of motor pole pairs;

[0012] The real-time operation status data is filtered.

[0013] Preferably, the performing power imbalance detection according to the real-time operating status data comprises:

[0014] Identify the power balance status and power change trend based on the real-time output active power and real-time load demand;

[0015] Evaluate wind turbine input power stability based on historical wind speed data.

[0016] Preferably, determining the magnitude of the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance comprises:

[0017] Calculate the current rotor kinetic energy based on the real-time moment of inertia, real-time rotor speed and motor pole pair number;

[0018] When the input power stability reaches a preset state, the kinetic energy of the rotor adjusted in real time is predicted according to the power balance state and the power change trend.

[0019] Preferably, the real-time control and adjustment of the rotor speed according to the real-time adjusted kinetic energy of the rotor comprises:

[0020] Calculate the target rotor speed according to the real-time adjusted kinetic energy of the rotor, the current moment of inertia, the current rotor speed and the number of motor pole pairs;

[0021] The corresponding mechanical actuator of the wind turbine generator set is controlled and adjusted in real time according to the target rotor speed.

[0022] Preferably, adjusting the moment of inertia according to the adjusted rotor speed in real time to ensure that the output power accurately tracks the target power includes:

[0023] adjusting the inertial momentum according to the difference between the adjusted actual output power and the target power, the damping power, and the adjusted rotor speed dynamic feedback;

[0024] Ensure that the output power accurately tracks the target power based on the adjusted inertial momentum.

[0025] Preferably, the specific formula for adjusting the inertial momentum according to the difference between the adjusted actual output power and the target power, the damping power and the adjusted rotor speed dynamic feedback is:

[0026]

[0027] Among them, P e is the target power, P m is the actual output power after adjustment, P D is the damping power, ω is the adjusted rotor speed, J v is the feedback moment of inertia.

[0028] The present invention also provides a frequency support device for a wind turbine generator set, comprising:

[0029] Data monitoring module, used to monitor the real-time operating status data of wind turbines;

[0030] A power balance detection module, used for performing power imbalance detection according to the real-time operation status data;

[0031] A kinetic energy adjustment calculation module is used to determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance;

[0032] A rotor speed adjustment control module, used for controlling and adjusting the rotor speed in real time according to the kinetic energy of the rotor adjusted in real time;

[0033] The feedback control module is used to adjust the moment of inertia according to the adjusted rotor speed in real time to ensure that the output power accurately tracks the target power.

[0034] The present invention also provides a frequency support device for a wind turbine generator set, comprising:

[0035] Memory for storing computer programs;

[0036] A processor is used to implement the above-mentioned steps of the wind turbine generator set frequency support method when executing the computer program.

[0037] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method for frequency support of a wind turbine generator set are implemented.

[0038] The above technical solution of the present invention has the following advantages compared with the prior art:

[0039] The frequency support method for wind turbine generator set described in the present invention detects the operating status of the wind turbine generator in real time. When the output active power and the active power required by the load are unbalanced, the method controls the rotor speed to quickly store or release kinetic energy to reduce or increase the output active power, thereby reducing the imbalance of active power and providing better support for the frequency in the short term. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0041] Figure 1 The present invention provides a flow chart for implementing a frequency support method for a wind turbine generator set. DETAILED DESCRIPTION

[0042] The core of the present invention is to provide a method, device, equipment and computer storage medium for frequency support of a wind turbine generator set, which can effectively use the wind turbine generator set to achieve good frequency support in a short period of time.

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Please refer to Figure 1 , Figure 1 This is a flow chart of a frequency support method for a wind turbine generator set provided by the present invention; the specific operation steps are as follows:

[0045] S101: monitor the real-time operating status data of the wind turbine generator set;

[0046] S102: Performing power imbalance detection according to the real-time operating status data;

[0047] S103: Determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance;

[0048] S104: controlling and adjusting the rotor speed in real time according to the kinetic energy of the rotor adjusted in real time;

[0049] S105: Adjust the moment of inertia according to the real-time feedback of the adjusted rotor speed to ensure that the output power accurately tracks the target power.

[0050] Based on the above embodiments, this embodiment describes step S101 in detail:

[0051] Obtaining real-time operating status data, including real-time output active power, real-time load demand, real-time rotor speed, real-time wind speed, real-time moment of inertia and number of motor pole pairs;

[0052] Deploy sensors: Install a variety of sensors, including but not limited to rotor speed sensors, anemometers, active power and reactive power sensors, at key locations of wind turbines, such as hubs, blade roots, generators, and control systems.

[0053] Data acquisition system: A high sampling rate data acquisition system is used to read sensor data in real time and transmit the data to the central processing unit through appropriate communication protocols (such as Ethernet, wireless communication, etc.).

[0054] Data synchronization: Ensure that the timestamps of all sensor data are synchronized so that the data can be accurately time-aligned and compared during data analysis.

[0055] The present invention ensures that the transient behavior of wind turbines and the real-time demand of the power grid can be captured through real-time monitoring, providing accurate data support for subsequent data analysis and control decisions; and improves the accuracy of data analysis through data synchronization, ensuring the consistency and effectiveness of control strategies.

[0056] · Perform filtering processing on the real-time operation status data.

[0057] Filter the raw data to remove noise and outliers and improve data quality. This may include low-pass filters, Kalman filters, or other signal processing techniques.

[0058] The present invention improves the accuracy and reliability of data analysis through data preprocessing, and provides high-quality data input for control decision-making.

[0059] Based on the above embodiments, this embodiment describes step S102 in detail:

[0060] Identify power balance status and power change trend based on the real-time output active power and real-time load demand;

[0061] Determine if there is a power imbalance by comparing real-time output active power to load demand. Identify patterns and trends in power imbalance using sliding window averages, difference equations, or other mathematical tools.

[0062] Evaluate the input power stability of wind turbines based on historical wind speed data.

[0063] Analyze wind speed data and evaluate the input power stability of wind turbines, including statistical analysis of wind speed, such as average wind speed, wind speed change rate, etc.

[0064] The present invention can quickly identify the state of the power grid and the operating conditions of the wind turbine generator set through power imbalance detection and wind speed evaluation, thus providing a basis for timely adjustment.

[0065] Based on the above embodiments, this embodiment describes step S103 in detail:

[0066] Calculate the current rotor kinetic energy based on the real-time moment of inertia, real-time rotor speed and number of motor pole pairs;

[0067] Using the Kinetic Energy Formula Calculate the current rotor kinetic energy, where J is the moment of inertia, p is the number of motor pole pairs, and ω is the rotor speed. The inertia time constant can be expressed as:

[0068]

[0069] In the formula, S is the rated capacity of the motor, that is, the inertia time constant is defined as the ratio of the rotational kinetic energy stored in the system to the rated capacity. This constant reflects the system's ability to suppress frequency fluctuations. By accelerating or decelerating the rotor, the rotor can absorb or release kinetic energy accordingly, thereby achieving a dynamic balance of the system's active power.

[0070] When the input power stability reaches a preset state, the kinetic energy of the rotor to be adjusted in real time is predicted according to the power balance state and power change trend.

[0071] The present invention ensures the accuracy and effectiveness of frequency support operation through kinetic energy demand calculation, avoids excessive or insufficient power adjustment, and improves the adjustment accuracy and efficiency of the wind turbine generator set.

[0072] Based on the above embodiments, this embodiment describes step S104 in detail:

[0073] Calculate the target rotor speed according to the real-time adjusted kinetic energy of the rotor, the current moment of inertia, the current rotor speed and the number of motor pole pairs;

[0074] The rotor rotational kinetic energy absorbed or released in the above process can be expressed as ΔE:

[0075]

[0076] Where ω1 and ω0 are the values ​​before and after the rotor speed changes. The normal operation of the doubly-fed asynchronous wind turbine generally ranges from 0.7pu to 1.2pu. If the maximum speed is reduced to the minimum speed, the kinetic energy that the rotor can release is about 65.97% of its maximum speed.

[0077] ·Control and adjust the corresponding mechanical actuator of the wind turbine generator set in real time according to the target rotor speed.

[0078] Control command generation: Based on the target speed, control commands are generated to adjust the inverter or pitch control system to change the actual speed of the rotor. This involves PID controllers, fuzzy logic controllers or other advanced control algorithms.

[0079] Actuator response: The VFD or pitch control system receives the control command and makes the appropriate adjustments to achieve the target speed. This may involve motor drives, hydraulic systems, or other mechanical actuators.

[0080] The present invention ensures that the wind turbine generator set can respond quickly and accurately to changes in the grid frequency through precise rotational speed adjustment, thereby improving the dynamic response capability of the system; and achieves precise adjustment of the output power of the wind turbine generator set through the generation of control commands and the response of the actuator, thereby improving the adjustment accuracy and efficiency of the system.

[0081] Based on the above embodiments, this embodiment describes step S105 in detail:

[0082] The inertial momentum is adjusted based on the difference between the adjusted actual output power and the target power, the damping power, and the adjusted rotor speed dynamic feedback; the output power is ensured to accurately track the target power based on the adjusted inertial momentum:

[0083] Monitor and record real-time changes in rotor speed and output power.

[0084] Calculate the difference between the target power and the actual power, taking the damping power into account.

[0085] According to the difference and damping power, the virtual inertia constant and rotor speed are dynamically adjusted to achieve the target power output.

[0086] Generate and implement new control commands to fine-tune the inverter or pitch control system to ensure output power accurately tracks target power.

[0087]

[0088] Among them, P e is the target power, P m is the actual output power after adjustment, P D is the damping power, ω is the adjusted rotor speed, and J v is the feedback moment of inertia.

[0089] The real-time feedback and closed-loop control strategy of the present invention enables wind turbines to continuously adapt to changes in grid conditions, improving the adaptability and robustness of the system. Dynamic adjustment ensures the continuity and effectiveness of frequency support operations, reduces grid frequency fluctuations, and improves the quality and reliability of power supply.

[0090] The frequency support method of the wind turbine generator set described in the present invention is that when the output active power and the active power required by the load are unbalanced, such as when the load is suddenly removed or put into operation, when the wind speed remains unchanged, the rotor will quickly store or release kinetic energy to reduce or increase the output active power, thereby reducing the imbalance of active power and providing better support for the frequency in the short term. This method allows the fan to release rotational kinetic energy to provide frequency support when the power is unbalanced, and the fan speed will decrease at this time.

[0091] The embodiment of the present invention also provides a structural block diagram of a frequency support device for a wind turbine generator set; the specific device may include:

[0092] Data monitoring module, used to monitor the real-time operating status data of wind turbines;

[0093] A power balance detection module, used for performing power imbalance detection according to the real-time operation status data;

[0094] A kinetic energy adjustment calculation module is used to determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance;

[0095] A rotor speed adjustment control module, used for controlling and adjusting the rotor speed in real time according to the kinetic energy of the rotor adjusted in real time;

[0096] The feedback control module is used to adjust the moment of inertia according to the adjusted rotor speed in real time to ensure that the output power accurately tracks the target power.

[0097] The wind turbine frequency support device of this embodiment is used to implement the aforementioned wind turbine frequency support method. Therefore, the specific implementation method of the wind turbine frequency support device can be seen in the implementation method part of the wind turbine frequency support method above. For example, the data monitoring module, the power balance detection module, the kinetic energy adjustment calculation module, the rotor speed adjustment control module, and the feedback control module are respectively used to implement steps S101, S102, S103, S104 and S105 in the above-mentioned wind turbine frequency support method. Therefore, its specific implementation method can refer to the description of the corresponding various parts of the implementation method, which will not be repeated here.

[0098] A specific embodiment of the present invention further provides a wind turbine generator set frequency support device, comprising: a memory for storing a computer program; and a processor for implementing the steps of the above-mentioned wind turbine generator set frequency support method when executing the computer program.

[0099] A specific embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method for frequency support of a wind turbine generator set are implemented.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0101] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A frequency support method for a wind turbine generator set, characterized in that: include: Monitor the real-time operating status data of wind turbines; Perform power imbalance detection according to the real-time operating status data; Determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance; The rotor speed is adjusted in real time according to the kinetic energy of the rotor adjusted in real time; The moment of inertia is adjusted based on real-time feedback of the adjusted rotor speed to ensure that the output power accurately tracks the target power.

2. The wind turbine generator frequency support method according to claim 1, characterized in that: The real-time operating status data of the wind turbine generator set to be monitored includes: Acquire real-time operating status data, wherein the real-time operating status data includes real-time output active power, real-time load demand, real-time rotor speed, real-time wind speed, real-time moment of inertia and number of motor pole pairs; The real-time operation status data is filtered.

3. The wind turbine generator frequency support method according to claim 2, characterized in that: The performing power imbalance detection according to the real-time operation status data comprises: Identify the power balance status and power change trend based on the real-time output active power and real-time load demand; Evaluate wind turbine input power stability based on historical wind speed data.

4. The wind turbine generator frequency support method according to claim 3, characterized in that: The step of determining the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance comprises: Calculate the current rotor kinetic energy based on the real-time moment of inertia, real-time rotor speed and motor pole pair number; When the input power stability reaches a preset state, the kinetic energy of the rotor adjusted in real time is predicted according to the power balance state and the power change trend.

5. The wind turbine generator frequency support method according to claim 2, characterized in that: The real-time control and adjustment of the rotor speed according to the real-time adjusted kinetic energy of the rotor comprises: Calculate the target rotor speed according to the real-time adjusted kinetic energy of the rotor, the current moment of inertia, the current rotor speed and the number of motor pole pairs; The corresponding mechanical actuator of the wind turbine generator set is controlled and adjusted in real time according to the target rotor speed.

6. The wind turbine generator frequency support method according to claim 1, characterized in that: The real-time feedback adjustment of the moment of inertia based on the adjusted rotor speed to ensure that the output power accurately tracks the target power includes: adjusting the inertial momentum according to the difference between the adjusted actual output power and the target power, the damping power, and the adjusted rotor speed dynamic feedback; Ensure that the output power accurately tracks the target power based on the adjusted inertial momentum.

7. The wind turbine generator frequency support method according to claim 6, characterized in that: The specific formula for adjusting the inertial momentum according to the difference between the adjusted actual output power and the target power, the damping power and the adjusted rotor speed dynamic feedback is: Among them, P e is the target power, P m is the actual output power after adjustment, P D is the damping power, ω is the adjusted rotor speed, J v is the feedback moment of inertia.

8. A frequency support device for a wind turbine generator set, characterized in that: include: Data monitoring module, used to monitor the real-time operating status data of wind turbines; A power balance detection module, used for performing power imbalance detection according to the real-time operation status data; A kinetic energy adjustment calculation module is used to determine the kinetic energy of the rotor to be adjusted in real time according to the real-time detection result of power imbalance; A rotor speed adjustment control module, used for controlling and adjusting the rotor speed in real time according to the kinetic energy of the rotor adjusted in real time; The feedback control module is used to adjust the moment of inertia according to the adjusted rotor speed in real time to ensure that the output power accurately tracks the target power.

9. A frequency support device for a wind turbine generator set, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of a wind turbine generator frequency support method as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a frequency support method for a wind turbine generator set as claimed in any one of claims 1 to 7 are implemented.

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