基于SSP补偿和变频控制的滑环设计

Design of Slip Ring Based on SSP Compensation and Variable Frequency Control

为避免传统滑环易磨损、易静电累积等缺点,提出一种基于串联串联并联(SSP)补偿和变频控制的新型环滑设计方法.首先,对非接触式滑环系统的磁路进行建模,并针对松耦合变压器的漏感和励磁电感分别进行补偿,即原边串联、副边串并联补偿;其次,考虑到温度等因素的影响,分析部分元器件的灵敏度,获得元器件参数变化和谐振频率变化的关系;再次,提出一种基于汉宁窗快速Fourier变换的相位差检测方法,可避免硬件水平的制约和提高抗干扰能力;最后,根据计算的相位差、临界品质因数,提出一种基于零相角的变频控制方法,使系统工作于零相角,从而减少无功功率的损耗.仿真结果表明,当元器件参数发生变化时,基于SSP补偿和变频控制的方法能够快速使系统工作于零相角状态,进而提高系统的工作效率.设计了一种原型机对所提方法进行验证,实验结果和仿真结果基本一致,与不补偿方法相比,所提方法的工作效率提高了5%.研究结果表明该方法具有较高的稳健性.

In order to avoid the disadvantages of the traditional slip ring,such as easy wear and easy accumulation of static electricity,a novel slip ring design method based on series series parallel(SSP)compensation and variable frequency control is proposed.First,the magnetic circuit of the non-contact slip ring is modeled.The leakage inductance and the magnetizing inductance of the loosely coupled transformer,namely the primary side series compensation and secondary side series parallel compensation,are compensated respectively.Next,due to the influence of temperature and other factors,the sensitivity of some components is analyzed,and the relationship between component parameter variation and resonance frequency variation is obtained.After that,a phase difference detection method based on Hanning window fast Fourier transform is proposed,which can avoid the restriction of hardware performance and improve the anti-interference ability.Finally,according to the calculated phase difference and critical quality factor,a variable frequency control method based on zero phase angle is proposed to help the system work at zero phase angle,thereby reducing the loss of reactive power.The simulation results show that when the component parameters change,the proposed method based on SSP compensation and variable frequency control can quickly help the system work in zero phase angle state,and then improve the efficiency of the system.A prototype is designed to verify the proposed method,and the experimental results are basically consistent with the simulation results.Compared with no compensation method,the efficiency of the proposed method is increased by 5%.The research results show that the method proposed has a high robustness.