基于电压脉冲注入和傅里叶拟合的转子绕线式同步起动/发电机初始位置检测方法  

Initial Rotor Position Estimation Method for a Wound-rotor Synchronous Starter/Generator Based on Voltage Pulse Injection and Fourier Fitting

作　　者：王锐[1] 刘卫国[1] 孙承浩 WANG Rui;LIU Weiguo;SUN Chenghao(School of Automation,Northwestern Polytechnical University,Xi’an 710072,Shaanxi Province,China)

机构地区：[1]西北工业大学自动化学院,陕西省西安市710072

出　　处：《中国电机工程学报》2022年第5期1981-1991,共11页Proceedings of the CSEE

摘　　要：由于转子绕线式同步起动发电机(wound-rotor synchronous starter/generator,WRSSG)的主发电机的电感参数变化较大且转子励磁磁链不恒定,传统的转子初始位置估计方法不再适用于WRSSG。为了提高转子初始位置的估算精度,提出一种基于三相感应电流峰值比较的电压脉冲注入法。根据dq轴电感的相对大小,研究不同注入电压脉冲幅值对峰值电流波形的影响。因此,选择适当的注入电压和励磁电压,以实现对初始转子位置的准确估计,并消除了极性检测过程。此外,还提出一种基于傅里叶级数的电流波形拟合方法,以补偿转子励磁磁链不稳定所带来的估计误差。得到了最适合拟合电流波形的3阶傅里叶级数。通过这些改进,该方法提高了转子初始位置估算的精度,具有良好的稳定性。最后,在实验室75kVA的WRSSG上对所提转子初始位置检测方法进行了实验验证。The traditional initial rotor position estimation method is not applicable to a wound-rotor synchronous starter/generator due to the large variation of inductance parameters and the instability of rotor excitation flux of the main generator(MG) of three-stage synchronous starter/generator(WRSSG). In order to improve the estimation accuracy, this paper proposed a voltage pulse injection method by comparing the peak of three-phase induced currents for initial rotor position estimation. The influence of different amplitudes of injected voltage pulses on the waveform of peak currents was studied based on the relative size of dq axis inductances. Accordingly, the injected voltage and excitation voltage were chosen properly to achieve an accurate estimation of the initial rotor position and to eliminate the polarity detecting process. Moreover, a current waveform fitting method by using Fourier series was proposed to compensate the estimated error brought by the unsteady rotor excitation flux. The third-order Fourier series, which was the most suitable order of Fourier series to fit the current waveform, was obtained. With these improvements, the accuracy of initial rotor position estimation was improved and the proposed method was of good robustness. Finally, all the theoretical analyses were validated by experiments on a laboratory 75kW WRSSG.

关 键 词：波形拟合 傅里叶级数 初始位置检测 主发电机 脉冲注入 饱和凸极性 转子绕线式同步起动发电机 

分 类 号：TM341[电气工程—电机]