风能转换系统容错控制策略研究

发布时间：2018-05-27 19:43

本文选题：风能转换系统 + T-S模糊　；参考：《江南大学》2014年硕士论文

【摘要】：提高风能转换系统的性能对风能产业的发展具有重要意义，为减少风力发电的成本提供了契机。由于风力发电的成本很大程度上是由风能捕获效率及其可靠性决定，近年来针对风能转换系统的容错控制策略的研究已受到显著关注。论文在充分理解风能转换系统最大风能捕获控制工作原理和国内外先进容错控制策略的基础上，开展了以下研究工作：针对T-S建模风能转换系统传感器故障，当一个传感器失效时，，利用其余完好的状态反馈回路平均分担已失效回路控制律的容错控制思想，设计了风能转换系统的状态反馈主动容错控制器。仿真实验表明所设计的容错控制系统在任意一个传感器失效时，均可以实现从正常系统控制到故障系统控制的无扰动切换，保证了系统在故障状态下的稳定运行，同时也验证了此容错控制器的可行性。针对风能转换系统执行器故障问题，分析了风能转换系统的状态方程，将风能转换系统中执行器连续增益故障转化成传动系统参数的不确定性，推导了风能转换系统的T-S模糊模型。采用状态反馈并行分布补偿结构，设计了风能转换系统执行器故障时的鲁棒容错控制器，并进行了稳定性证明。仿真结果表明风能转换系统在发生执行器故障时，仍能够实现额定风速以下的最大风能捕获，减缓了故障恶化的程度，提高了机组利用率。针对风能转换系统中执行器故障，基于滑模控制理论，论文提出了一种新型的主动容错控制策略。设计滑模故障观测器，实时动态采集执行器故障前后数据信息，对执行器故障进行重构，达到实时故障检测的目的。通过补偿控制，保证了滑模控制器对风能转换系统的可靠控制，实现了对执行器故障主动容错的功能。仿真结果表明滑模故障观测器能够实时精确地重构风能转换系统执行器故障，主动补偿容错控制器在不影响风能转换系统动态性能的情况下，仍能实现系统的最大风能捕获。
[Abstract]:Improving the performance of wind energy conversion system is of great significance to the development of wind energy industry and provides an opportunity to reduce the cost of wind power generation. Since the cost of wind power generation is largely determined by the wind energy capture efficiency and its reliability, the research on fault tolerant control strategies for wind power conversion systems has attracted considerable attention in recent years. On the basis of fully understanding the working principle of maximum wind energy capture control and advanced fault-tolerant control strategies at home and abroad, the following research work is carried out in this paper: Aiming at the sensor failure of T-S modeling wind energy conversion system, when one sensor fails, the fault-tolerant control idea of the failed loop control law is equally shared by the other intact state feedback loops. A state feedback active fault-tolerant controller for wind energy conversion system is designed. Simulation results show that the designed fault-tolerant control system can be switched from normal system control to fault system control without disturbance when any sensor fails, which ensures the stable operation of the system in the fault state. The feasibility of the fault-tolerant controller is also verified. Aiming at the problem of actuator failure in wind energy conversion system, the state equation of wind energy conversion system is analyzed, and the continuous gain fault of actuator in wind energy conversion system is transformed into the uncertainty of transmission system parameters. The T-S fuzzy model of wind energy conversion system is derived. A robust fault-tolerant controller for wind energy conversion system with actuator failure is designed using a state feedback parallel distributed compensation structure and its stability is proved. The simulation results show that the wind energy conversion system can still realize the maximum wind energy capture below the rated wind speed when the actuator failure occurs, which can slow down the deterioration of the fault and improve the utilization ratio of the unit. Based on sliding mode control theory, a novel active fault-tolerant control strategy is proposed for actuator faults in wind power conversion systems. The sliding mode fault observer is designed to dynamically collect the data before and after the actuator fault and to reconstruct the actuator fault to achieve the purpose of real-time fault detection. Through the compensation control, the sliding mode controller can guarantee the reliable control of wind power conversion system, and realize the function of active fault tolerance for actuator fault. The simulation results show that the sliding mode fault observer can accurately reconstruct the actuator fault of the wind energy conversion system in real time, and the active compensation fault tolerant controller can achieve the maximum wind energy capture without affecting the dynamic performance of the wind energy conversion system.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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