A method for determining faults of a wind turbine generator

Abstract

The present invention provides a fault judgment method for a wind turbine, comprising the following steps: S1: detecting real-time data of a wind turbine; S2: when the wind turbine generator set is in a standby state, the active power of the wind turbine generator is less than or equal to 0; S3: then confirming the cut-in wind speed of the wind turbine generator with a wind speed greater than 130%; S4: then confirming that the wind speed is in a state of not more than 15 m / s; S5: confirming that steps S2 to S4 last for 16 minutes or more; S6: if it lasts for more than 16 minutes, confirming that the wind turbine generator has a fault and needs on-site processing. The present invention comprehensively judges the fault of the wind turbine generator not generating electricity in strong winds according to the active power, wind speed and cut-in wind speed of the wind turbine generator, and judges the fault that needs to be processed on-site according to the duration and real-time state of the wind turbine not generating electricity; the present invention is suitable for all wind turbines.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbines, and in particular relates to a fault judgment method for a wind turbine. Background Art

[0002] Wind turbines (hereinafter referred to as wind turbines) are the basic production units of wind power companies. Wind turbines can only be built in windy areas. The wind direction and wind speed of high-altitude winds are changeable, which makes wind turbines operate under variable load conditions for a long time. In areas with relatively strong winds, the working environment of wind turbines is even worse. Under such unfavorable conditions, the probability of wind turbine failure will increase; with the increase in wind turbine operation time, the number of failures during operation will increase; due to the inherent characteristics of the wind energy industry, wind turbines are widely distributed in wind farms, and under normal operation, there is no one on-site on duty. Timely and accurate judgment of wind turbine failures is a rigid requirement for wind power companies.

[0003] The existing method of judging wind turbine faults is to comprehensively judge the fault of the wind turbine based on the active power, speed and fault status reported by the wind turbine PLC, and judge the fault that needs to be handled on site based on the duration of the fault status and the real-time status of the wind turbine. The PLC fault status is not universal between each model; there are more and more types of wind turbines, and there is no unified fault judgment rule between each model, resulting in a large deviation between the judgment result and the actual status of the wind turbine, and some wind turbines that do not generate electricity in strong winds cannot be judged. Summary of the invention

[0004] The purpose of the present invention is to provide a method for determining the fault of a wind turbine generator according to the duration of no power generation in strong winds and the real-time status.

[0005] The present invention provides a fault diagnosis method for a wind turbine generator, comprising the following steps:

[0006] S1: Detect real-time data of wind turbines;

[0007] S2: When the wind turbine generator set is in standby mode, the active power of the wind turbine generator is less than or equal to 0;

[0008] S3: then confirming that the wind speed is greater than 130% of the cut-in wind speed of the wind turbine;

[0009] S4: Then confirm that the wind speed is not greater than 15m / s;

[0010] S5: Confirm that steps S2 to S4 last for 16 minutes or more;

[0011] S6: If it lasts for more than 16 minutes, it is confirmed that the wind turbine is faulty and needs on-site treatment.

[0012] Furthermore, in step S1, a detection device is used to detect the real-time data of the wind turbine, and the detection device is built into the wind turbine or externally placed outside the wind turbine.

[0013] Furthermore, when the wind turbine is in standby mode, the status of the wind turbine is standardized into six states: "operation", "standby", "fault", "maintenance", "power restriction" and "offline".

[0014] Furthermore, when steps S2 to S5 last for 16 minutes or more, the wind turbine in the "standby" state will in some cases switch to the "offline" state, and the condition for entering the "offline" state is that the real-time data has not changed for 15 minutes.

[0015] Furthermore, a plurality of blades are provided in the wind turbine, and the plurality of blades are arranged in a circle; when the generating wind of the wind turbine blows, the generating wind blows onto the blades of the wind turbine and the plurality of blades rotate on the entire circular surface; after the blades rotate: the angular velocity of the plurality of blades is the same, and the linear velocity at each blade radius is different, and the farther the radius, the higher the linear velocity.

[0016] The present invention comprehensively determines the failure of a wind turbine to generate electricity in strong winds based on the active power, wind speed and cut-in wind speed of the wind turbine, and determines the failure that needs to be handled on site based on the duration and real-time status of the failure to generate electricity in strong winds; the present invention is suitable for all wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0018] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0019] The technical solution of the present invention is described in detail below with specific embodiments.

[0020] Figure 1 and is a flow chart of a fault judgment method for a wind turbine generator according to the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The present invention discloses a fault judgment method for a wind turbine generator, such as Figure 1 As shown, Figure 1 The "wind turbine" in the text is the abbreviation of "wind turbine", which includes the following steps:

[0023] S1: Detect real-time data of wind turbines;

[0024] S2: When the wind turbine generator is in standby mode, the active power of the wind turbine generator is less than or equal to 0;

[0025] S3: then confirming that the wind speed is greater than 130% of the cut-in wind speed of the wind turbine;

[0026] S4: Then confirm that the wind speed is not greater than 15m / s;

[0027] S5: Confirm that steps S2 to S4 last for 16 minutes or more;

[0028] S6: If it lasts for more than 16 minutes, it is confirmed that the wind turbine is faulty and needs on-site treatment.

[0029] In step S1, a detection device (built-in or external) is used to detect the real-time data of the wind turbine. The detection device is built-in or external to the wind turbine.

[0030] For step S2, the active power of the photovoltaic inverter is less than or equal to 0. Why does the power ≤ 0 appear? For the active power of the photovoltaic inverter is less than or equal to 0, if two generators A and B are running in parallel, under normal circumstances, each generator is sending power to the grid, and the power meter indicates positive power. When the voltage regulator of generator A fails, it not only does not generate electricity, but its winding becomes the load of generator B. This phenomenon is called backflow. At this time, the power meter of generator A shows a negative value, that is, reverse power.

[0031] Negative power may occur during the operation of grid-connected wind turbines. Generally, it occurs when the wind speed is near the starting wind speed. Since the output power of the wind turbine is very small at this time, when the wind speed suddenly becomes low or the wind direction changes, the unit will not stop running immediately, but will yaw or continue to run for a period of time. At this time, negative power will often occur. If the wind speed is lower than the low wind cut-out wind speed, the negative power exceeds the limit or exceeds the specified time, the wind turbine will cut out of operation and enter the wind waiting state.

[0032] For step S3, the cut-in wind speed refers to the minimum wind speed at which the wind turbine generator set starts to generate electricity through grid connection. A wind speed > 130% of the cut-in wind speed indicates that the wind turbine generator set is in a wind speed environment where it can generate electricity. The generator sets that should generate electricity but do not are distinguished according to steps S2 to S4.

[0033] When the wind turbine is working, the detection equipment detects the real-time data of the wind turbine. When the detection equipment monitors that the wind turbine is in standby state, the active power of the wind turbine (active power is the power when the wind turbine is running) is less than zero, then the wind speed continues to be detected at a cut-in wind speed of more than 130%, and then it is confirmed that the wind speed is not more than 15m / s. If the above conditions are confirmed to last for more than 16 minutes, it is confirmed that the wind turbine is faulty and needs on-site processing.

[0034] When the wind turbine is in standby mode, the status of the wind turbine is standardized into six states: "operation", "standby", "fault", "maintenance", "power limit" and "offline". Fault and standby are states where the wind turbine is not generating electricity.

[0035] For wind speeds not exceeding 15m / s, wind speeds above 15m / s are considered gale forces of level 7 or above.

[0036] A plurality of blades are arranged in a circle in the wind turbine.

[0037] The wind from the wind turbine blows over, and the wind is evenly blown onto the blades of the wind turbine and the entire circular surface of the blade rotation. After the blades rotate, although the angular velocity of the blades is the same, the linear velocity obtained at each blade radius is different. The farther the radius, the higher the linear velocity. Then, the linear velocity near the axis of the wind turbine is very slow, while the wind force at the center of the wind turbine is the same as that at the far radius, which creates reverse resistance relative to the outer ring torque direction. Especially in strong winds, the wind speed is very fast, and the blades rotate fast. At this time, the reverse resistance is very obvious. The blade radius near one-third of the center begins to oscillate inside and outside, and the intensity of the oscillation increases with the increase of wind force. In order to prevent the blades from breaking under the front-back oscillation and the internal-external oscillation, some wind turbines will also be in a "standby" state under strong winds, so the wind turbine failure is determined and these wind turbines are excluded.

[0038] The above conditions last for 16 minutes: In some cases, the wind turbine will switch to the "offline" state when it is in the "standby" state. The condition for entering the "offline" state is that the real-time data has not changed for 15 minutes. In order not to affect the original judgment rules, the "fault" of not generating electricity when it should be generated is delayed by 16 minutes.

[0039] The present invention comprehensively determines the failure of a wind turbine to generate electricity in strong winds based on the active power, wind speed and cut-in wind speed of the wind turbine, and determines the failure that needs to be handled on site based on the duration and real-time status of the failure to generate electricity in strong winds; the present invention is suitable for all wind turbines.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for determining a fault of a wind turbine generator, characterized in that: The steps include: S1: Detect real-time data of wind turbines; S2: When the wind turbine generator set is in standby mode, the active power of the wind turbine generator is less than or equal to 0; S3: then confirming that the wind speed is greater than 130% of the cut-in wind speed of the wind turbine; S4: Then confirm that the wind speed is not greater than 15m / s; S5: Confirm that steps S2 to S4 last for 16 minutes or more; S6: If it lasts for more than 16 minutes, it is confirmed that the wind turbine is faulty and needs to be handled on site; When steps S2 to S5 last for 16 minutes or more, the wind turbine in the "standby" state will be transferred to the "offline" state in some cases. The condition for entering the "offline" state is that the real-time data has not changed for 15 minutes; a plurality of blades are arranged in a circular shape in the wind turbine; when the generating wind of the wind turbine blows, the generating wind blows onto the blades of the wind turbine and the entire circular surface on which the plurality of blades rotate; after the blades rotate: the angular velocities of the plurality of blades are the same, and the linear velocities at the radius of each blade are different, and the farther the radius, the higher the linear velocity.

2. The fault diagnosis method of a wind turbine generator according to claim 1, characterized in that: In step S1, a detection device is used to detect real-time data of the wind turbine. The detection device is built into the wind turbine or externally placed outside the wind turbine.

3. The fault diagnosis method for a wind turbine generator according to claim 1, characterized in that: When the wind turbine is in standby mode, the status of the wind turbine is standardized into six states: "operation", "standby", "fault", "maintenance", "power limit" and "offline".

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