Shutdown control method and system of wind generating set and storage medium thereof

Abstract

The shutdown control method and system of the wind generating set and the storage medium of the shutdown control method comprise the steps that when it is monitored that a preset type of shutdown fault occurs in the wind generating set, machine side staged power reduction control is carried out according to the power at the fault occurrence time point; in the first preset power reduction working interval, the power of the generator is controlled to be reduced to preset switching power according to a first preset power reduction rate; and in the second preset power reduction working interval, responding to the switching power triggering event, and controlling the power of the generator to be reduced to the cut-out power of the generator from the second preset power reduction rate.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation control, and in particular to a shutdown control method and system for a wind power generator set and a storage medium thereof. Background Art

[0002] In the actual operation of wind turbines, different shutdown control strategies are adopted according to different shutdown control needs and triggering events. For example, in shutdown events triggered by low-level faults, open-loop shutdown is often used to implement shutdown control of wind turbines. However, the shutdown control process needs to take into account the influence of multiple factors, which makes the shutdown control process relatively complicated, which is not conducive to the rapid and effective control of wind turbines and causes energy loss during the shutdown process.

[0003] Based on the above defects, the present invention proposes a shutdown control method, system and storage medium of a wind turbine generator set based on power reduction, so that the unit can smoothly reduce the speed and achieve the purpose of reducing the unit load. It has the characteristics of simple and practical control, fast and effective. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the above-mentioned background technology and provide a shutdown control method, system and storage medium for a wind turbine generator set based on power reduction, so that the unit can smoothly reduce the speed and achieve the purpose of reducing the load of the unit. It has the characteristics of simple and practical control, fast and effective.

[0005] To achieve the above-mentioned purpose, the present invention provides a shutdown control method for a wind turbine generator set, comprising: when a preset type of shutdown fault is monitored in the wind turbine generator set, performing a staged power reduction control on the machine side according to the power at the time when the fault occurs; in a first preset power reduction working interval, controlling the generator power to decrease to a preset switching power at a first preset power reduction rate; in a second preset power reduction working interval, in response to a switching power trigger event, controlling the generator power to decrease from a second preset power reduction rate to the generator cut-out power.

[0006] Optionally, the first preset power reduction rate and the second preset power reduction rate both perform power control in a uniform rate reduction manner.

[0007] Optionally, one of the first preset power reduction rate and the second preset power reduction rate is a uniform rate reduction, and the other is a non-uniform rate reduction.

[0008] Optionally, the first preset power reduction rate is greater than the second preset power reduction rate.

[0009] Optionally, in the second preset power reduction working interval, the modulated generator power is reduced from the preset switching power to the generator cut-out power at a second preset power reduction rate, and the set speeds corresponding to each power in the working interval are obtained through a preset speed power table, and the real-time torque is obtained through a speed torque controller. If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque is within the preset torque deviation range, the control torque is reduced to 0.

[0010] Optionally, if the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque exceeds a preset torque deviation range, the shutdown event risk level of the wind turbine generator set is upgraded and adjusted.

[0011] Optionally, in response to the shutdown process duration exceeding the maximum time allowed for the shutdown process, a rapid torque cut-out is immediately performed, and the machine-side torque is controlled to be reduced to zero.

[0012] Optionally, after the generator-side torque drops to 0, the generator-side circuit breaker and the grid-side circuit breaker are controlled to open, and the start-stop process is completed.

[0013] A second wind turbine generator control system of the present invention includes:

[0014] A processor, adapted to implement one or more computer programs in a method for controlling a wind turbine generator set according to one of the present invention; and

[0015] A computer storage medium storing one or more computer programs, wherein the one or more computer programs are suitable for being loaded and executed by the processor to implement the control method of a wind turbine generator set according to one of the present invention.

[0016] A third aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it is used to execute the control method of a wind turbine generator set as described in one of the present inventions.

[0017] In summary, the present invention proposes a shutdown control method, system and storage medium for a wind turbine generator set based on power reduction, which enables the unit to smoothly reduce the speed and achieve the purpose of reducing the load of the unit. It has the characteristics of simple and practical control, fast and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a flow chart of a shutdown control method of a wind turbine generator set according to an exemplary embodiment of the present invention.

[0019] Figure 2 The figure is a power-speed diagram of the shutdown control process of an exemplary embodiment of the present invention.

[0020] Figure 3 Another power-speed diagram of the shutdown control process of an exemplary embodiment of the present invention.

[0021] Figure 4 Schematic diagram of a shutdown control system according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to explain the technical content, control flow, objectives and effects of the present invention in detail, embodiments are given below and described in detail with reference to the accompanying drawings.

[0023] As an example, a shutdown control method of a wind turbine generator set according to an exemplary embodiment disclosed in one of the present invention may be executed by a power conversion system (eg, a controller of the power conversion system) or other controllers of the wind turbine generator set (eg, a main controller of a main control system).

[0024] See also Figures 1 to 3 In step S101, when a preset type of shutdown fault is detected in a wind turbine generator set, power reduction control is performed in stages on the generator side according to the power at the time when the fault occurs.

[0025] As an example, the preset type of shutdown failure may include, but is not limited to, failures that do not affect the normal operation of the converter system, failures that do not affect the normal operation of the pitch system, and low risk level failures, such as manual shutdown, temperature and / or pressure-related failures. Of course, the preset type of shutdown failure may also include other appropriate types of shutdown failures, and the preset type of shutdown failure may be specifically set according to actual conditions and specific needs (for example, risk level), without limitation. In addition, as an example, serious hardware failures of the converter system, fires in the electrical system, and serious power grid anomalies may not be included in the preset type of shutdown failures. It should be clear that, especially when it comes to shutdown failures that seriously affect the safe operation of the wind turbine, it should not be included in the preset type of shutdown failure disclosed in the present invention. The preset type of shutdown failure should be a failure that causes a wind turbine shutdown event when the wind turbine is safe and controllable.

[0026] In step S102, in a first preset power reduction working interval, the generator power is controlled to decrease to a preset switching power at a first preset power reduction rate.

[0027] In step S103, in the second preset power reduction working interval, in response to a power switching trigger event, the generator power is controlled to decrease from a second preset power reduction rate to the generator cut-out power.

[0028] In the control method of the wind turbine generator set according to the exemplary embodiment of the present disclosure, the first preset power reduction rate and the second preset power reduction rate are both used to control power at a uniform rate, and the first preset power reduction rate is greater than the second preset power reduction rate.

[0029] In other feasible embodiments, the first preset power reduction rate and the second preset power reduction rate may be one of which is a uniform rate reduction and the other is a non-uniform rate reduction, and the first preset power reduction rate is greater than the second preset power reduction rate.

[0030] According to the exemplary embodiment, the control method of the wind turbine generator set also includes: a second preset power reduction working interval, modulating the generator power from the preset switching power to the generator cut-out power at a second preset power reduction rate, obtaining the real-time speed corresponding to each power in the working interval through a preset speed power table, and obtaining the real-time torque through a speed torque controller. If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque is within the preset torque deviation range, the control torque is rapidly reduced to 0 at a constant ratio or directly dropped to 0.

[0031] According to an exemplary embodiment, the control method of a wind turbine generator set also includes: if the difference between the real-time torque collected when the power drops to the generator cut-out power and the cut-out theoretical torque exceeds a preset torque deviation range, the shutdown event risk level of the wind turbine generator set is upgraded and adjusted to trigger a shutdown control with a higher risk level.

[0032] The control method of the wind turbine generator set according to the exemplary embodiment further includes: immediately executing a fast torque cut-out in response to the shutdown process duration exceeding a maximum allowed shutdown process execution time, and controlling the machine-side torque to be rapidly reduced to zero.

[0033] The control method of the wind turbine generator set according to the exemplary embodiment further includes: after the machine-side torque drops to 0, controlling the machine-side circuit breaker and the grid-side circuit breaker to open, and the start-stop process is completed.

[0034] According to the exemplary embodiment, it can be determined without doubt that the focus of the protection of the present invention is: on the one hand, the shutdown control is performed based on power and matching the corresponding speed during the shutdown control process, and on the other hand, the shutdown control is performed in the form of phased reduction of the generator power during the shutdown control process. Compared with other solutions, the shutdown solution disclosed by the present invention is simpler and more practical, and improves the shutdown control efficiency of the unit.

[0035] As an example, the rotation speed of the wind turbine generator system may be an impeller rotation speed or a generator rotation speed.

[0036] The shutdown control process according to an exemplary embodiment is shown in the power-speed diagram, where P t Indicates the power of the generator at the time of the fault; P1 indicates the preset switching power when the generator switches from the first preset power reduction rate to the second preset power reduction rate during phased shutdown; P0 indicates the generator cut-out power; n tIndicates the speed of the generator at the time of fault; n0 indicates the cut-out speed.

[0037] The shutdown control process includes the following stages:

[0038] Time 0: A shutdown fault (i.e., the above-mentioned preset type of shutdown fault) is triggered; the shutdown control process is started, i.e., the shutdown control method for a wind turbine generator set according to the exemplary embodiment disclosed in the present invention is started;

[0039] 0~t1 period: the first preset power reduction working interval, the modulated generator is based on the power P of the generator at the time of the fault t The power is reduced to P1 according to the first preset power reduction rate, wherein the first preset power reduction rate can be based on P t1 =P t -k1t to reduce power and shut down, P t1 is the first target power in the period from 0 to t1, k1 is a constant, t∈(0, t1);

[0040] Time period t1-t2: the second preset power reduction working interval, the modulated generator power is reduced from the preset switching power P1 to P0 according to the second preset power reduction rate, wherein the second preset power reduction rate can be based on P t2 = P1-k2t to reduce power and shut down, P t1 is the second target power in the period of t1 to t2, k2 is a constant, t∈(0, t2-t1), the set speed corresponding to each power in the working range is obtained through the preset speed power table, and the set torque is obtained through the speed torque controller (i.e., PI controller). When the power drops to the cut-out power, the cut-out theoretical torque corresponding to the cut-out power point is calculated by the preset speed power table and the speed torque controller. If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque is within the preset torque deviation range, the control torque is rapidly reduced to 0 or directly reduced to 0 at a constant ratio, and then the machine-side circuit breaker and the grid-side circuit breaker are controlled to open, and the shutdown process is completed. If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque exceeds the preset torque deviation range, the risk level of the wind turbine shutdown event is upgraded and adjusted, and the response includes but is not limited to events such as severe hardware failure of the converter system, fire in the electrical system, and severe power grid abnormality triggering a high-risk shutdown control.

[0041] t max Time period: When the shutdown process lasts longer than t max Then the torque quick cut-out control is executed immediately, where t max Indicates the maximum time allowed for the shutdown process to execute.

[0042] For example, in a specific embodiment, the first preset power reduction rate is reduced at a uniform rate (specifically, the first preset power reduction rate may be P t1 =P t -k1t to reduce power and shut down), the second preset power reduction rate is reduced at a non-uniform rate (specifically, the second preset power reduction rate can be a power reduction and shutdown P in a preset second-level increment form t2 =P1-(n-1)P a ), P a is the power reduction amount in each preset second-level time, t∈(0, t2-t1), and n is the number of corresponding power control points when the power reduction shutdown is performed in a preset second-level increment form from t1 to t2. The above example is only an illustrative example of using different power reduction rates in stages for shutdown control. Other specific power reduction technical means that can be used by ordinary technicians in this field are not repeated here.

[0043] By optimizing the open-loop shutdown strategy for normal shutdown faults, the shutdown process is controlled by the power reduction rate in stages. For example, according to the exemplary embodiment of the present disclosure, when the shutdown control is performed at the first preset power reduction rate greater than the second preset power reduction rate, on the one hand, in the first stage of shutdown, the load of the wind turbine generator set can be effectively reduced to a safer and controllable range in the shortest possible time, and on the other hand, in the second stage of shutdown control, the wind turbine can be shut down more smoothly. At the same time, compared with the shutdown scheme through the torque-speed control method, it is simpler and more practical, and the control efficiency of the unit is improved.

[0044] The present invention is particularly applicable to shutdown events caused by shutdown faults with relatively low risk levels as exemplified in the exemplary embodiments, which generally perform shutdown control in an open-loop shutdown manner, and the method is practical, simple, fast and effective.

[0045] See also Figure 4 A second wind turbine generator control system of the present invention includes:

[0046] A processor, adapted to implement one or more computer programs in the method for controlling a wind turbine generator set according to one of the present invention; and

[0047] A computer storage medium storing one or more computer programs, wherein the one or more computer programs are suitable for being loaded by the processor and executing the control method of a wind turbine generator set as described in one of the present invention.

[0048] The wind turbine control system described in the second aspect of the present invention can be completed by the wind turbine main control system or the converter system that is part of the wind turbine, or it can be one or more identical control terminals, or it can be one or more different control terminals, or it can be a server cluster or distributed system composed of multiple physical servers, or it can be a cloud server for cloud computing services.

[0049] A third aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, it is used to execute the control method of the wind turbine generator set as described above.

[0050] The computer storage medium provided by the present invention is a memory device in the wind turbine control system, which is used to store programs and data. It is understandable that the computer storage medium here can include both the built-in storage medium of the wind turbine control system and the extended storage medium supported by the wind turbine control system. The computer storage medium provides a storage space, which stores the operating system of the wind turbine control system. In addition, one or more computer programs suitable for being loaded and executed by the processor are also stored in the storage space.

[0051] The embodiment of the present invention further provides a computer program product or a computer program, the computer program product includes a computer program, the computer program is stored in a computer-readable storage medium, the processor reads the computer program from the computer-readable storage medium, and the processor executes the computer program.

[0052] The technical solutions described above are only preferred embodiments of the present invention. Any equivalent changes or substitutions made on the basis of the present invention are included in the scope of the claims of the present invention.

Claims

1. A shutdown control method for a wind turbine generator set, characterized in that: The shutdown control method includes: When a preset type of shutdown fault is detected in a wind turbine generator set, the power reduction control is carried out in stages according to the power at the time of the fault. In a first preset power reduction working interval, controlling the generator power to decrease to a preset switching power at a first preset power reduction rate; In the second preset power reduction working interval, in response to the power switching trigger event, the generator power is controlled to decrease from the second preset power reduction rate to the generator cut-out power.

2. A control method for a wind turbine generator set according to claim 1, characterized in that: The first preset power reduction rate and the second preset power reduction rate both perform power control in a uniform rate reduction manner.

3. A control method for a wind turbine generator set according to claim 1, characterized in that: Of the first preset power reduction rate and the second preset power reduction rate, one is a uniform rate reduction, and the other is a non-uniform rate reduction.

4. A control method for a wind turbine generator set according to claim 2 or 3, characterized in that: The first preset power reduction rate is greater than the second preset power reduction rate.

5. A control method for a wind turbine generator set according to claim 1, characterized in that: In the second preset power reduction working range, the modulated generator power is reduced from the preset switching power to the generator cut-out power according to the second preset power reduction rate. The set speed corresponding to each power in the working range is obtained through the preset speed power table, and the real-time torque is obtained through the speed torque controller. If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque is within the preset torque deviation range, the control torque is reduced to 0.

6. A control method for a wind turbine generator set according to claim 5, characterized in that: If the difference between the real-time torque collected when the power drops to the cut-out power and the cut-out theoretical torque exceeds the preset torque deviation range, the shutdown event risk level of the wind turbine generator set is upgraded and adjusted.

7. A control method for a wind turbine generator set according to claim 1, characterized in that: In response to the shutdown process duration exceeding the maximum allowed shutdown process execution time, the torque is quickly cut out immediately, and the machine side torque is controlled to be reduced to 0.

8. A control method for a wind turbine generator set according to claim 1, characterized in that: After the torque on the generator side drops to 0, the generator side circuit breaker and the grid side circuit breaker are controlled to open, and the start and stop process is completed.

9. A wind turbine generator control system, characterized in that: include: A processor, adapted to implement one or more computer programs in the method for controlling a wind turbine generator set according to any one of claims 1 to 8; as well as A computer storage medium storing one or more computer programs, wherein the one or more computer programs are suitable for being loaded and executed by the processor to implement the control method of the wind turbine generator set according to any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it is used to execute the control method of the wind turbine generator set according to any one of claims 1 to 8.

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