摘要
为了提高级联式无刷双馈风力发电系统的可靠性,提出一种基于模型参考自适应方法的新型电流观测器,用于功率侧绕组电流传感器的故障诊断及容错控制。在功率侧定子磁链定向双同步速坐标系下,建立级联式无刷双馈发电机的数学模型并从中提取控制绕组电流状态空间方程作为参考模型;在构建可调模型时,通过矩阵分离来避免时变系统复杂的极点配置问题;基于李雅普诺夫稳定性理论构造电流观测器的自适应律,其中非理想稳态不可忽略的功率绕组电流微分项通过公式推导证明能够用可调模型的输出进行置换。仿真分析结果表明,所构建的观测器精度高,具备在控制系统中替代功率绕组电流传感器工作的能力,能够实现系统容错控制。
In order to improve the reliability of cascade brushless doubly-fed wind power generation system,a novel current observer based on model reference adaptive method is proposed for fault diagnosis and fault-tolerant control of power winding current sensor.The mathematical model of cascade brushless doubly-fed generator(BDFG)is built in the power side stator flux oriented double synchronous speed coordinate system,and the state space equation of control winding current is extracted as the reference model.The complex pole assignment problem of time-varying systems is avoided by matrix separation when constructing adjustable models.Base on the Lyapunov stability theory,the adaptive law of current observer is constructed.And the current differential term of power winding which cannot be neglected in non-ideal steady state is proved to be replaced by the output of adjustable model through formula deduction.The simulation results show that the proposed observer has high precision,and it has the ability to replace the power winding current sensor in the control system,thus the faulttolerant control of the system can be realized.
作者
兰志勇
沈凡享
李理
曹春堂
王钰琳
Lan Zhiyong;Shen Fanxiang;Li Li;Cao Chuntang;Wang Yulin(The College of Information Engineering Xiangtan University,Xiangtan 411105 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第13期2901-2912,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51507148)
风力发电机组及控制湖南省重点实验室开放研究基金(2016FLFDYB02)资助。
关键词
无刷双馈风力发电机
功率绕组电流观测器
模型参考自适应
容错控制
Brushless doubly-fed wind generator
power winding current observer
model reference adaptive
fault-tolerant control
