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access icon free Novel orthogonal signal generator for single phase PLL applications

© The Institution of Engineering and Technology
Received 21/06/2017, Accepted 08/10/2017, Revised 15/09/2017, Published 11/10/2017

Single-phase phase-locked loops (PLLs) are used in various types of power electronics applications, including voltage source inverters, pulse width modulation rectifiers and different types of grid-tied power converter utilities. The orthogonal signal generators (OSGs), used in single-phase PLLs, are generally based on various types of filters, and they need to operate robustly in relation to the grid voltage disturbances and frequency variations. In this study, a novel OSG is proposed based on a modified first-order all-pass filter, which enables the PLL phase detector to operate at different response speeds, tuned by means of a single parameter. The PLL is experimentally verified and compared with a number of conventional solutions. Tests include responses to phase angle disturbances, frequency steps, and PLL input voltage distortions. Results show that a novel OSG filter enables faster PLL responses when compared with several conventional OSG filters, all designed to have the same disturbance attenuation at double fundamental frequency.

Inspec keywords: invertors; signal generators; all-pass filters; phase locked loops; power electronics; voltage-source convertors; power grids; PWM rectifiers

Other keywords: voltage source inverters; OSG filter; orthogonal signal generator; modified first-order all-pass filter; power electronics applications; PLL phase detector; frequency variations; grid-tied power converter utilities; pulse width modulation rectifiers; single-phase phase-locked loops; grid voltage disturbances; single-phase PLL applications

Subjects: AC-DC power convertors (rectifiers); DC-AC power convertors (invertors); Signal generators

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