Design and Tuning of a Modified Power-Based PLL for Single-Phase Grid-Connected Power Conditioning Systems

Abstract

One of the most important aspects for the proper operation of the single-phase grid-tied power-conditioning systems is the synchronization with the utility grid. Among various synchronization techniques, phase locked loop (PLL) based algorithms have found a lot of interest for the advantages they present. Typically, the single-phase PLLs use a sinusoidal multiplier as the phase detector (PD). These PLLs are generally referred to as the power-based PLL (pPLL). In this paper, the drawbacks associated with the pPLL technique (i.e., the sensitivity to the grid voltage variations, and the double frequency oscillations which appear in the estimated phase/frequency) are discussed in detail, and some of the previously reported solutions are examined. Then, to overcome these drawbacks, a simple and effective technique, called the double-frequency and amplitude compensation (DFAC) method is proposed. The effectiveness of the proposed method is evaluated through a detailed mathematical analysis. A systematic design method to finetune the PLL parameters is then suggested, which guarantees a fast transient response, a high disturbance rejection capability, and a robust performance. Finally, the simulation and experimental results are presented, which highlight the effectiveness of the proposed PLL.

Quadrature signal generator based on all-pass filter for single-phase synchronization

“…This can be done by making the α component equal to the phase voltage and the β component equal to zero [9]. However, this produces a mirror-frequency term in the obtained voltage vector, which needs to be removed, a filter or a decoupling network can be used for this purpose.…”

“…Assuming perfect tracking of the fundamental component, i.e. , the error signal (8) can be expressed as (9). It is observed that the phase error consists of two harmonic components of orders n±1.…”

Frequency-Adaptive Modified Comb-Filter-Based Phase-Locked Loop for a Doubly-Fed Adjustable-Speed Pumped-Storage Hydropower Plant under Distorted Grid Conditions

“…A major challenge of PLLs is how to quickly and accurately estimate the phase angle and frequency when the grid voltage is distorted. To overcome this challenge, combining filtering techniques into the structure of PLLs has been proposed in the literature [13][14][15][16][17][18][19][20][21][22][23][24]. Reference [14] used a double, or more synchronous reference frame (DSRF/MSRF), to realize the decoupling between the fundamental negative sequence and the positive sequence components, and then locking the phase angle by extracting the fundamental positive sequence component, which can realize a fast and dynamic response.…”

A New PLL Simulation Validation for Three-phase Grid under Heavy Distorted Conditions

“…Various synchronization techniques have been proposed in literatures. The zero crossing detection methods [3], the space-vector filtering (SVF) method [4], the artificial neural networks (ANN) method [5], the recursive weighted least-squares estimation (WLSE) algorithm [6], the discrete Fourier transform (DFT) and its modifications [7], the methods based on the concept of adaptive notch filtering (ANF) [8], the Kalman filtering technique [9], the frequency-locked loop (FLL) methods [10], three phase open-loop phase-locked method [11] and the phase-locked loop (PLL) algorithms [12,13] are among the existing synchronization techniques.…”