Power System Stability and Control

P. Kundur, Power System Stability and Control, McGraw Hill, 1994.

Power System Analysis

J. Grainger, W. Stevenson, Power System Analysis, 1ed,  McGraw Hill, 1994.

Power Systems Harmonics

G. J. Wakileh, Power Systems Harmonics: Fundamentals, Analysis and Filter Design, 1ed, Springer, 2001.

Power Quality in Electrical Systems

A. Kusko, M. T. Thompson, Power Quality in Electrical Systems, 1ed, McGraw Hill, 2007.

Handbook of Power Quality

A. Baggini, Handbook of Power Quality, Willey, 2008.

Power Quality in Power Systems and Electrical Machines

E. F. Fuchs, M. A. S. Masoum, Power Quality in Power Systems and Electrical Machines, London: Elsevier Academic Press, 2008.

Power Quality Primer

B. Kennedy, Power Quality Primer, New York: McGraw Hill, 2000.

Electrical Power Systems Quality

S. Santoso, H. W. Beaty, R. C. Dugan, M. F. McGranaghan, Electrical Power Systems Quality, 2ed, New York: McGraw Hill, 2003.

Signal Processing of Power Quality Disturbance

M. H. J. Bollen, Irene Y. H. Gu, Signal Processing of Power Quality Disturbances, Wiley-IEEE Press, 2006.

Power System Harmonic Analysis

J. Arrillaga, B. C. Smith, N. R. Watson, A. R. Wood, Power System Harmonic Analysis, Willey, 1997.

This is an excellent book on Power Quality, mainly dealing with Power System Harmonic Analysis. I strongly recommend this for both beginners and experts alike in the field of electrical, power systems, and power quality engineering.