Abstract

The paper presents a novel phase-locked loop (PLL)-based resonant frequency tracking method for linear compressors with oscillatory motions. The proposed method achieves the phase-locked control between two signals by using PLL, which includes a multiplier, and a low-pass filter to obtain the phase signal difference. Consequently, based on the phase signal difference, the electrical frequency of the power supply can be adjusted through a PI (proportional-derivative) regulator such that the phase signal difference converges to 90° and the linear compressor works under the resonant frequency conditions. The analytical expression of the resonant frequency condition is proposed for the linear compressor. Then, the detailed design and procedure of the proposed method are presented. The designed method and the resonant frequency characteristics are verified by using the simulation experiment. The simulated results demonstrate that the proposed algorithm has faster response speed and higher convergence accuracy to step load change in comparison with the other commonly used algorithms.

中文翻译：

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线性往复式压缩机新型基于锁相环的谐振频率跟踪控制

摘要

本文提出了一种新颖的基于锁相环 (PLL) 的谐振频率跟踪方法，用于具有振荡运动的线性压缩机。所提出的方法通过使用包括乘法器和低通滤波器以获得相位信号差的PLL来实现两个信号之间的锁相控制。因此，基于相位信号差，可以通过 PI（比例微分）调节器调整电源的电频率，使相位信号差收敛到 90°，线性压缩器在谐振频率条件下工作。提出了线性压缩机谐振频率条件的解析表达式。然后，提出了该方法的详细设计和过程。通过仿真实验验证了所设计的方法和谐振频率特性。仿真结果表明，与其他常用算法相比，所提算法对阶跃载荷变化具有更快的响应速度和更高的收敛精度。