To better capture the phase information of single-phase power grids, a novel single-phase phase-locked loop method is proposed in this paper. The method uses a tracking differentiator as an orthogonal signal generator. Because the generator is sensitive to the input signal’s frequency, the amplitudes of the tracking and differential signals may not be equivalent, causing a failed phase tracking. Therefore, the amplitude correction of the differential signal needs to be done. Then, the corrected differential signal and the tracking signal are both input to the phase detector. To further verify the practical feasibility of the method, the voltage sampling and phase tracking experiments were performed on a digital signal processor-based inverter experimental platform, which is aimed to simulate the grid. The experimental results show that the proposed algorithm has strong dynamic performance and steady-state performance under different states of the power grid, and the phase-locked method has a practical feasibility in single-phase grid-connected applications.

中文翻译：

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基于跟踪微分器的单相锁相环

为了更好地捕捉单相电网的相位信息，本文提出了一种新颖的单相锁相环方法。该方法使用跟踪微分器作为正交信号发生器。由于发生器对输入信号的频率很敏感，跟踪信号和差分信号的幅度可能不相等，从而导致相位跟踪失败。因此，需要对差分信号进行幅度校正。然后，校正后的差分信号和跟踪信号都输入到相位检测器。为了进一步验证该方法的实际可行性，在基于数字信号处理器的逆变器实验平台上进行了电压采样和相位跟踪实验，旨在模拟电网。