A New Dynamic Synchrophasor Estimator for Digital Relaying

ABSTRACT

One of the most important challenges in modern protective requirements is in security and accuracy in the presence of different fluctuations in the network. Therefore, techniques with faster and more accurate estimations have to be developed to measure waveform phasors under steady-state and transient conditions. This paper proposes a new least error squares algorithm based on Taylor series to improve the performances of the phasor estimators. The accuracy is improved by using the fundamental phasor estimations and their estimated derivatives of Taylor series for the next step calculation. Then the proposed algorithm is evaluated through several simulations that specified in the Standard IEEE C37.118.1-2011 for different conditions. By using the proposed algorithm, a remarkable result is achieved in the presence of decaying DC component and harmonics. In addition, to demonstrate the performances of the proposed algorithm, a comparison with the conventional algorithms has also been presented.

KEYWORDS:

• Dynamic phasor estimation
• Fundamental component estimation
• IEEE standard
• Least error squares
• Power system protection
• Synchrophasor
• Taylor series

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Sh. Sadraeifar

Shima Sadraeifar was born in Kashan, Iran, in 1990. She received the BSc degree in electrical engineering from the university of Kashan, Kashan, Iran, in 2012, and the MSc degree from the Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran, in 2015. Her current research interests include power system protection, operation and control of power system and smart grid.

E-mail: [email protected]

H. Askarian Abyaneh

Hossein Askarian Abyaneh (M’00–SM’09) was born in Abyaneh, Iran. He received the PhD degree in electrical power system engineering from the University of Manchester Institute of Science and Technology, Manchester, UK, in 1988. He is currently a professor with the Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran. His current research interests include protection, power quality, restructuring, and deregulation in power systems.

E-mail: [email protected]

A. Ketabi

Abbas Ketabi (M’09) received the BSc and MSc degrees in electrical engineering from the Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran, in 1994 and 1996, respectively, and the PhD degree in electrical engineering jointly from the Sharif University of Technology and the Institute National Polytechnique de Grenoble, Grenoble, France, in 2001. He has been with the Department of Electrical Engineering, University of Kashan, Kashan, Iran, since 2001, where he is currently an associate professor. His current research interests include power system restoration, smart grids, renewable energy, optimization shape of electric machines, and evolutionary computation. Dr Ketabi was the recipient of the University of Kashan Award for distinguished teaching and research. He is the manager and an editor of the Energy: Engineering and Management journal.

E-mail: [email protected]

S.H.H. Sadeghi

Seyed Hossein Hesamedin Sadeghi (M’92–SM’05) received the BS degree in electrical engineering from the Sharif University of Technology, Tehran, Iran, in 1980, the MS degree in power engineering from the University of Manchester Institute of Science and Technology, Manchester, UK, in 1984, and the PhD degree in electronic systems engineering from the University of Essex, Colchester, UK, in 1991. He is currently a professor of electrical engineering at the Amirkabir University of Technology, Tehran. His current research interests include electromagnetic nondestructive evaluation of materials and electromagnetic compatibility issues in electrical engineering and electronics.

E-mail: [email protected]