In multilevel inverters (MLI), output voltage waveform consists of dominant low order harmonics, which needs to be minimized. Simultaneously, good control over the fundamental for desirable operation is needed. this paper, an atom search optimization (ASO) based selective harmonic elimination (SHE) method proposed a variable dc bus reduced component count (RCC) MLI. ASO population-based metaheu...

This paper presents an adaptive harmonic current extraction scheme using notch filters combined with a modified discrete wavelet-packet transform (DWPT). The is applied to MMCC-STATCOM for mitigating harmonics distortion in power line. DWPT incorporates data expansion technique overcome the limitations of boundary effect. It identifies rms values dominant elements non-stationary real-time, thes...

The growing installed wind capacity over the last decade has led many energy regulators to define specific grid codes for generation systems connecting electricity grid. These requirements impose strict laws regarding Low Voltage Ride Though (LVRT) and High (HVRT) capabilities of turbines during voltage disturbances. main aim this paper is propose LVRT HVRT strategies that allow remain connecte...

—This paper studies the frequency estimation of twodimensional (2-D) harmonics in presence of multiplicative and additive noise. We construct a cyclic covariance matrix using a class of cyclic covariance of the 2-D harmonics. Exploiting the shift-invariance structure of the signal subspace, we extend ESPRIT to estimate the frequency pairs of 2-D harmonics in multiplicative and additive noise. ...

Variable Elimination (VE) is the most basic one of many Bayesian network inference algorithms. The speed and complexity reasoning mainly depend on order elimination. Finding optimal elimination a Nondeterministic Polynomial Hard (NP-Hard) problem, which often solved by heuristic search in practice. In to improve variable method, minimum, maximum potential, minimum missing edge added methods are...

This study aims to derive simple formulas for calculating the accurate Total Harmonic Distortion (THD) of Multilevel Inverter (MLIs), that considers all low and high order harmonics, for single phase and three phase MLIs., since the THD is a main criterion when judging the performance of a MLI. In addition, a formula for the percentage route mean square value of high order harmonics %VHOrms is ...

A novel Short Time Fourier Transform (STFT) based speech enhancement method is introduced. This method enhances the magnitude spectrum of a noisy speech segment. The new idea that is used in this method is to basically reconstruct the harmonics at the multiples of the fundamental frequency ( 0 F ) rather than trying to improve them. The harmonics are produced, in the magnitude spectrum, using t...

Harmonic estimation is essential for mitigating or suppressing harmonic distortions in power systems. The most important idea that spectrum analysis, waveform estimation, source classification, location, the determination of contributions, data clustering, and filter-based elimination capacity are also considered. feature extraction method a fundamental component optimization improves effective...