基于模型参考自适应的无刷双馈电机独立发电系统转速辨识方法  

Speed Estimation Method for Brushless Doubly-fed Machine Stand-alone Generation System Based on Model Reference Adaptivity

作　　者：马骁[1] 陈宇[1] 苏婧媛 康勇[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2017年第17期5171-5180,共10页Proceedings of the CSEE

基　　金：台达环境与教育基金会电力电子科教发展计划(DREM2015001)~~

摘　　要：基于无刷双馈电机的独立发电系统可用于偏远地区的独立供电及舰船轴带发电等场合,但该系统中的测速码盘在一定程度上抵消了电机无刷化带来的好处。引入转速辨识技术,通过辨识算法获得实时转速信息可解决这一问题。该文将模型参考自适应思路引入无刷双馈独立发电控制系统中,构建了一种改进型的模型参考自适应系统(model reference adaptive system,MRAS)用于转速辨识。该MRAS的坐标系依控制绕组电流矢量定向,选取控制绕组电流q轴分量(常数零)作为参考模型,并以需辩识的转子转速为变量构造控制绕组q轴分量的可调模型。该MRAS不但简化了参考模型与可调模型的求解,还使得参考模型与可调模型的矢量叉乘运算简化为标量作差运算。此外,由于该MRAS由可测电压和电流为基础独立构造,因此可与多种控制方案配合使用,具有较好的通用性与灵活性。Stand-alone generation system based on brushless doubly-fed machine （BDFM） can be used in remote areas for individual power supply or ship shaft generation. However, the speed encoder in the system partly weakens the benefits introduced by the brushless structure. This problem can be solved by introducing speed estimation technology, which gets real-time speed information through estimation algorithm. In this paper, the model reference adaptive concept was introduced into the BDFM stand-alone generation system, and an improved model reference adaptive system （MRAS） was structured for rotor speed estimation. The reference frame in the proposed MRAS was aligned with control winding （CW） current vector of the BDFM, the q-axis CW current component （constant zero） was selected as the reference model, and the q-axis CW current estimation model with rotor speed as variable was treated as the adjustable model. Such a MRAS not only simplifies the calculations of the reference and adjustable models, but also turns the operation of vector cross- multiplication between the reference model and the adjustable model into the operation of scalar subtraction. In addition, the proposed MRAS is generality and flexibility because it is based on the measurable voltages and currents, and thus is adaptable to different control systems.

关 键 词：转速辨识 无刷双馈电机 独立发电系统 模型参考自适应 

分 类 号：TM341[电气工程—电机]