Harmonic frequency estimation under nonsinusoidal conditions

Dash, Monalisa (2007) Harmonic frequency estimation under nonsinusoidal conditions. MTech thesis.



Accurate estimation of power system fundamental frequency is a necessity to check the state of health of the power index. This paper presents a hybrid technique for harmonic frequency estimation of non-sinusoidal signals of power systems with high order harmonics using central numerical differentiation and digital FIR filter algorithm. A digital low-pass FIR filter is used to obtain the discrete values of the fundamental sinusoidal component, and a set of digital bandpass FIR filter is applied to compute the discrete values of the harmonic component. Using 6 points numerical differentiation, these discrete values are used for fundamental and harmonic frequency estimation. For a signal with 5 harmonics, the technique requires at most 2 cycles for the first time of estimation computation, and requires at most 1 cycle for the latter estimation. Comparing with other existing techniques, the proposed algorithm is characteristic of high accuracy and much less time. With satisfactory results, a study example is given to illustrate the proposed algorithm in Matlab.

Item Type:Thesis (MTech)
Uncontrolled Keywords:Nonsinusoidal conditions, Harmonic frequency, FIR
Subjects:Engineering and Technology > Electrical Engineering > Power Systems
Divisions: Engineering and Technology > Department of Electrical Engineering
ID Code:4307
Deposited By:Hemanta Biswal
Deposited On:10 Jul 2012 11:08
Last Modified:10 Jul 2012 11:08
Supervisor(s):Panda, P C and Routa, S

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