Conventional sliding mode control (SMO) utilizes a sign function and low-pass filter (LPF) to achieve sensorless of permanent magnet synchronous motor (PMSM). However, the introduction generates large number high harmonics, resulting in significant system output chattering, whereas addition LPF delays phase shifts. These degrade PMSM speed position estimation accuracy reduce performance. To imp...

Recently utilities and end users become more concerned about power quality issues because the load equipments are more sensitive to various power quality disturbances, such as harmonics and voltage fluctuation. Harmonic distortion and voltage flicker are the major causes in growing concern about electric power quality. Power quality disturbance monitoring plays an important role in the deregula...

The quality of energy produced in renewable energy systems has to be at the high level specified by respective standards and directives. The estimation accuracy of grid signal parameters is one of the most important factors affecting this quality. This paper presents a method for a very fast and accurate amplitude and phase grid signal estimation using the Fast Fourier Transform procedure and m...

Presented here is an amplitude and frequency modulation method (AFMM) for extracting damage-induced nonlinear characteristics and intermittent transient responses by processing steady-state/transient responses using the empirical mode decomposition, Hilbert-Huang transform (HHT), and nonlinear dynamic characteristics derived from perturbation analysis. A sliding-window fitting (SWF) method is d...

This paper proposes a wide-band noise reduction method using temporal accumulated spectrum and zero phase (ZP) signal. In the previous study, we replace the ZP signal around the origin with the ZP signal in the second or latter period to get an estimated speech ZP signal. For very low SNR environment, reliable period estimation is difficult. This paper presents a study of period estimation in n...

In this paper, we describe the concept of music scene description and address the problem of detecting melody and bass lines in real-world audio signals containing the sounds of various instruments. Most previous pitch-estimation methods have had difficulty dealing with such complex music signals because these methods were designed to deal with mixtures of only a few sounds. To enable estimatio...

The Selective Harmonic Elimination (SHE) technique is the fundamental switching frequency scheme which is used to eliminate specific order harmonics. In this paper, the elimination of low order harmonics in cascaded multilevel inverter with equal DC sources is proposed. The modulation strategy used here is SHEPWM in which non linear equations that characterize the low order harmonics are obtain...

Multiharmonic tones containing resolved harmonics (1-7) of a fundamental, unresolved harmonics (8-24) of a fundamental, or both resolved and unresolved harmonics (1-24) were presented to listeners at each of six octaves ranging from 32 to 1024 Hz. There also were modified versions of each stimulus in which alternate harmonics were either attenuated or phase shifted. Listeners were asked to judg...

Computation of active and reactive powers is a crucial step in droop-controlled single-phase voltage source inverters (VSIs) standalone microgrid since the performance stability power-sharing strategy are strongly influenced by its speed accuracy, especially case non-linear loads. Here, an improved among VSIs islanded microgrid, considering DC component nonlinear loads presented. To achieve thi...