Wind turbine generator fault-tolerant control method based on robust self-adaption and sliding mode variable structure control

Abstract

Aiming at safety problems caused by two common faults such as a constant deviation fault of an actuator of a wind power generation system, the invention provides a fault fan control method based on robust self-adaption control and sliding mode variable structure control. Firstly, multi-model predictive control is adopted as a fault tolerance strategy of the wind power generation system, and when the wind power generation system breaks down, a corresponding control strategy is switched according to the fault type, so that the purpose of fault tolerance is achieved. On the basis, it is considered that a control law needs to have universality instead of specific model structures or specific parameters, fault fan model errors and uncertainty of parameters of a fault fan are considered, and the robustness and the self-adaption degree of fault-tolerant control are improved through robust self-adaption control and sliding mode variable structure control. According to the method, the corresponding control strategy can be effectively switched according to the fault type, and the purpose of stable fault tolerance is achieved.

Description

technical field [0001] The present invention relates to a technical field of wind power generation and fault-tolerant control, specifically a method for fault-tolerant control of wind turbines based on robust self-adaptation and sliding mode variable structure control; Background technique [0002] The wind power industry is developing rapidly, but as the total installed capacity of wind power continues to increase, the economic losses caused by unit failures will become more serious; frequent failures will not only shorten the service life of the wind turbines, but also increase the operating costs of the wind farm. The power generation efficiency of the wind turbine is reduced, and in severe cases, it will cause irreversible damage to the connected grid. Therefore, some potential faults of the wind turbine must be detected and fault-tolerant control, and the operating status of the wind turbine must be detected to ensure The safe operation of wind turbines; in fact, a larg...

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Problems solved by technology

[0002] The wind power industry is developing rapidly, but as the total installed capacity of wind power continues to increase, the economic losses caused by unit failures will become more serious; frequent failures will not only shorten the service life of the wind turbines, but also increase the operating costs of the wind farm. The power generation efficiency of the wind turbine is reduced, and in severe cases, it will cause irreversible damage to the connected grid. Therefore, some potential faults of the wind turbine must be detected and fault-tolerant control, and the operating status of the wind turbine must be detected to ensure The safe operation of wind turbines; in fact, a large number of faults have occurred in the actual installation and operation of the wind power system during the initial run-in process, which has affected the normal operation of the wind turbine and reduced the overall operating efficiency of the wind turbine; according to statistics, in Among the wind turbines operated by a domestic power company, after experiencing various failures, only one-third of the more than 300 wind turbines can actually run, and the operating efficiency is terrible; At the initial stage of wind turbine installation, the same problem will also be encountered, which greatly reduces the operating efficiency of the equipment; considering that many wind turbines in China are installed in areas with harsh environments and are affected by various environmental factors, the failure rate is high. And the unplanned maintenance service fee is very expensive, the adoption of fault detection, diagnosis and fault-tolerant control scheme can have some effect on the period from the fault detection to the next scheduled maintenance of the turbine, which will reduce the operating cost of wind power and improve the life of the unit It is obviously helpful and can effectively promote the development and utilization of wind energy;

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