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Harmonic estimation plays a vital role in maintaining power system, and for reliable measurement of the harmonics, Windowed Interpolated Fast Fourier Transform (WIFFT) has been used. In this paper, supply voltage harmonics are analysed by Triangular Self-Convolution Window (TSCW), Hanning and Hamming WIFFT. TSCW is ameliorated window than previously existing Hanning and Hamming windows. By comparing...
Nowadays the utilisation of electrical power is increasing exponentially in the present modern living style. In order to meet the consumer load demand, expansion in the power system network is essential. To provide continuous and reliable power supply, a smart power system needs to identify any abnormal conditions on overhead transmission lines such as line faults in minimum time. The fault detection,...
Power system harmonics are inevitable in the presence of non-linear loads. The presence of harmonics has a greater impact on the terminal apparatus. Accurate analysis of Power system harmonics plays an important role to have a better mitigation. Windowed Interpolated FFT (WIFFT) based algorithms are gaining importance due to their accurate analysis. The major advantage of WIFFT based algorithms includes...
Fast Fourier Transform (FFT) is used to obtain the Fourier spectrum of a periodic signal, but it is well known that special care must be taken to avoid severe distortions introduced by the sampling process. The major errors associated with this algorithm are spectral leakage and picket fence effect. This paper discusses the advancement in FFT algorithms for harmonic analysis in power system by applying...
The penetration of solar Photo Voltaic (PV) systems to the grid is gradually being increased as an alternative to conventional energy sources. The interfacing of solar PV systems to the grid requires efficient control strategies for the operation, control and Power Quality (PQ) improvement. This paper proposes a three-level Hysteresis Current Control (HCC) strategy for grid connected four leg Voltage...
Hysteresis Current Control (HCC) technique is one of the popular current control techniques used for active power filtering application. However the conventional two level HCC have limitations of variable switching frequency and harmonic behavior that varies with interfacing inductance. To resolve these issues an improved three level HCC for single phase shunt active power filter (APF) has been proposed...
Space vector pulse width modulation (SVPWM) has been extensively utilized in the three-phase voltage source inverters (VSI) for the benefit of fixed switching frequency, full utilization of DC bus voltage and superior control. In recent times, SVPWM technique was applied for active power filter (APF) control application, as the APF is nothing but of a current controlled VSI. The conventional SVPWM...
Three-phase four-wire (3P4W) electrical distribution systems are extensively utilized in commercial and industrial sectors. These electrical distribution systems are facing severe power quality issues such as current harmonics, reactive power, and load unbalancing, excessive neutral current. This paper presents the analysis, design and digital simulation of a hysteresis current controller (HCC) based...
Spectral leakage is one of the perilous effects on the accuracy of harmonic analysis based on Discrete Fourier Transform (DFT)/Fast Fourier Transform (FFT). FFT will provide accurate harmonic estimation when the sampling is synchronous. If the sampling is asynchronous it leads to spectral leakage and picket fence effect. Depending upon the system fundamental frequency spectral leakage and picket fence...
The Indian Space capsule (SRE-1) launched aboard PSLV-C7 rocket, was recovered successfully in the Bay of Bengal on January 22, 2007 after its orbital sojourn of 12 days. Apart from serving as a platform for micro-gravity experiments, SRE-1 demonstrated ISRO's capability in the field of orbital reentry and recovery technologies. Satish Dhawan Space Centre (SDSC SHAR), the Spaceport of India was given...
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