Control method and system for improving wind energy utilization rate of wind turbine generator

Abstract

The invention belongs to the technical field of wind power generation, and relates to a control method and system for improving the wind energy utilization rate of a wind turbine generator. According to the control method and system, a blade which is determined to have a blade clamping fault is subjected to variable pitch driver resetting, a variable pitch driver is restarted before the blade clamping fault is not eliminated, and is not directly restarted, so that the unnecessary restarting frequency of the variable pitch driver is reduced, the aging speed of the system is reduced, and the utilization rate of wind energy is improved. According to the control method and system, a delay blade clamping fault factor is further introduced, the probability of occurrence of the blade clamping fault in the future is expected according to the variable pitch state information of the current time period, the variable pitch driver does not need to be directly restarted, the restarting frequency is further reduced, and the wind energy utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a control method and a control system for improving the utilization rate of wind energy of a wind turbine. Background technique [0002] A wind turbine generally includes a hub and blades, and the blades are connected to the hub through pitch bearings. When the wind turbine is running, each blade needs to adjust its own pitch angle, that is, the blades are pitched. During the pitching process of the blades, the pitching control component drives the blades to rotate by controlling actuators such as the pitching motor to adjust the pitch angle of itself. [0003] In the prior art, usually when the pitch driver is detected to be faulty and the blades are stuck, the machine is shut down directly and the blades that are not stuck are feathered and shut down. For example, the publication number is CN110925137A, which discloses a large-scale wind turbine with a blade stuck ...

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Problems solved by technology

[0003] In the prior art, usually when the pitch driver is detected to be faulty and the blades are stuck, the machine is shut down directly and the blades that are not stuck are feathered and shut down. For example, the publication number is CN110925137A, which discloses a large-scale wind turbine with a blade stuck fault. In the feathering method of shutdown, when at least one blade is stuck, the converter provides the braking torque, and the converter is disconnected to complete the shutdown operation, but this reduces the utilization efficiency of wind energy, and frequent shutdowns will also cause system failure. aging faster

At the same time, the patent of invention with the publication number CN109707563A discloses a pitch drive restart control method, device, and wind turbine. The controller sends a restart command to the pitch drive, but such a direct restart will increase the number of restarts of the unnecessary pitch drive and increase the probability of failure; at the same time, only the pitch status / pitch information at the current moment / current period Determine whether the current blade is stuck, but cannot make a pitch fault prediction based on the expected pitch state in the future time period. When a propeller stuck fault occurs in the future time period, the fault cannot be identified and eliminated in the first time, thereby reducing the operating safety of the unit also reduces the utilization efficiency of wind energy

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