基于励磁机准旋转变压器运行原理的三级式电机转子位置估算研究

三级式起动发电机起动控制需要准确的主电机转子位置信息。基于励磁机的主电机转子位置估算技术将位置估算对象由工况复杂的主电机迁移到同轴安装的励磁机，充分发掘了三级式电机的运行和结构特点，在高性能位置估算方面潜力较好。而现有研究还未充分认识到励磁机的准旋转变压器功能，局限于从励磁机转子电流的稳态特征中提取位置信息，研究路线还不明晰。本项目拟从“激励输入、位置调制信息输出、位置信息解算”三个环节开展基于励磁机的主电机转子位置估算研究。首先，拟从励磁机转子激励信号注入机理及转子位置调制规律、励磁机转子位置调制信号反电势观测模型两方面入手阐明励磁机准旋转变压器运行原理这一动态分析理论；然后，拟针对励磁机转子位置调制信号反电势分段特征设计锁相环位置跟踪器，提出基于励磁机的主电机转子位置估算策略。项目成果可为高性能主电机转子位置估算算法提供参考，有效提升三级式电机无位置传感器起动控制的可靠性和稳定性。

Starting control of the three-stage starter generator requires accurate rotor position knowledge of the main generator (MG). The main exciter (ME) based rotor position estimation methods of MG transfer the position estimation object from MG, with complex working conditions, to coaxially installed ME, which fully explore the operation and structural characteristics of the three-stage machine and have potential in high-performance position estimation. However, the existing research has not fully figured out the quasi-resolver function of ME and is limited to extract position information from the steady-state characteristics of the rotor current of ME, resulting in an unclear research route. This project intends to conduct research of the ME based rotor position estimation method of MG from three aspects which are excitation input, position modulation information output, and position information resolution. Firstly, the excitation signal injection mechanism of ME rotor, the ME rotor position modulation law, and the observer model of back electromotive force (EMF) related with ME rotor position modulation signals are intended to be carried out to clarify the quasi-resolver operation principle of ME, which is the dynamic analysis theory for ME based rotor position estimation methods. Then, this project intends to design a phase-locked loop position tracker according to the piecewise features of back EMF related with ME rotor position modulation signals, and propose a ME based rotor position estimation method of MG. Achievements of this project can provide a theoretical reference for the high-performance rotor position estimation algorithm of MG, and effectively improve the reliability and stability of sensorless starting control of the three-stage machine.