A New Robust Experimentally Validated Phase Locked Loop for Power Electronic Control

Abstract

P.L.L is one of the circuits frequently used in control in power electronic, such as in active power filters. Its first role in electronic applications, is to identify the frequency (or the angular position) of a periodical signal, in order to generate another signal synchronised with the last one. However, many power applications need a perfect sine signal phase locked to the utility voltages. As the utility voltages are not always sinusoidal and balanced, a P.L.L is used in order to extract its fundamental component. In this paper, a classical P.L.L with all mathematical development confirmed by simulations will be first studied. Then a new robust solution, which provides very good results under unbalanced and distorted voltages, will be proposed. Simulations, validated by experimentations, will confirm the proposed design. An application case will be studied in order to illustrate the performances of this new P.L.L.

Keywords:

• Phase locked loop
• Robustness
• multi-variable filter
• active power filter

Additional information

Notes on contributors

Mohamed Choukri Benhabib

Mohamed Choukri BENHABIB, recieved the DEUA degree in 1994, BSc degree in 1998, and MSc degree in 2001, all in Electrical Engineering at University of science and technology of Oran / Algeria. He is currently Ph.D. student in GREEN laboratory Nancy / France. His research interests include active power filter and power quality.

Shahrokh Saadate

Shahrokh SAADATE, born in Tehran/IRAN on May 5th, 1958, received his diplôme d’ingenieur (1982), DEA (1982), thèse de doctorat (1986) and Habilitation à diriger les recherches (1995) from ENSEM, INPL, GREEN laboratory NANCY / FRANCE. Currently, his is Professor in Génie Electrique, in the Université Henri poicaré, Nancy 1. His main research domain is power systems, Power quality and Power Electronics.