双馈风电机组转速观测及容错控制策略  

Studies on the Rotor Speed Observation and Fault-tolerant Control Strategy for Wind Turbine Driven Doubly-fed Induction Generator

作　　者：李辉[1] 赵猛[1] 赵斌[1] 杨超[1] 唐显虎 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆市400044 [2]重庆前卫仪表厂风电控制设备分公司,重庆市401121

出　　处：《电力系统自动化》2011年第1期77-82,共6页Automation of Electric Power Systems

基　　金：输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512710101);重庆市科技攻关计划项目(CSTC;2008AB3050)~~

摘　　要：从旋转电机稳定运行基本原理出发,提出了一种基于锁相环的双馈感应发电机(DFIG)转速冗余信号观测方法,并研究了基于故障诊断的转速传感器容错控制策略。在介绍双馈风电机组控制系统转速信号作用的基础上,首先建立了基于锁相环的DFIG转速信号观测器模型;其次,通过对风速阶跃变化情况下双馈风电机组运行性能的仿真,将所构建的转速观测器输出值分别与转速传感器和闭环转速观测器输出值进行比较;最后,提出了一种自适应阈值的转速传感器故障诊断方法及相应的容错控制策略,并以转速传感器可能的软、硬故障类型为例,对机组的容错控制性能进行了仿真。研究结果表明,提出的转速观测器模型能更好地实现机组转速信号的冗余,并能准确地实现机组转速传感器故障时的容错控制。From the basic principle of rotating machines stable operation, a rotor speed redundant signal observation method for doubly-fed induction generator （DFIG） is proposed, and the fault tolerant control strategy of the rotor speed sensor is studied by the fault diagnosis. First, by introducing the role of rotor speed signal on the wind turbine driven DFIG control system, a rotor speed observer model of DFIG based on a PLL method is established. Secondly, by the simulation on the operation performance for wind turbine driven DFIG under a step change of wind speed, the output values of the proposed rotor speed observer are compared with the results from the rotor speed sensor output and the closed-loop speed observer from the presented literature respectively. Finally, an adaptive threshold speed signal fault diagnosis method and fault-tolerant control strategy is also proposed, using the examples of the possible soft and hard fault types of the rotor speed sensor, the fault- tolerant control performance of wind turbine driven DFIG is investigated. The compared results show that the proposed speed observer model has a better performance to achieve the redundancy for the rotor speed signal, and the fault-tolerant control of the rotor speed sensor can also be exactly performed when the sensor has a fault.

关 键 词：风力发电 双馈感应发电机 转速观测器 传感器故障 容错控制 

分 类 号：TM315[电气工程—电机]