This paper presents a novel control method to improve the efficiency of low-voltage DC-DC converters at light loads. Pulse Width Modulation (PWM) converters have poor efficiencies at light loads, while pulse frequency modulation (PFM) control is more efficient for the same cases. Switching losses constitute a major portion of the total power loss at light loads. To decrease the switching losses...

This paper presents a novel methodology for the calculation of angular indexes an electrical system from stationary analysis, using load flow and nose curves (P–V) in each buses to perform control actions preserve or improve voltage stability. The are proposed considering method based on concepts cutset angle (CA) center (COA). target is fast estimation voltage-stability margins through appropr...

A simple maximum torque per ampere (MTPA) method is designed for interior permanent magnet synchronous motors (IPMSMs) with no current control. The proposed tracks the rotor speed by finding best pair of voltage angle and amplitude each motor’s condition. This achieved without stand any control loop using a single controller, which makes technology to great extent, contrary majority methodologi...

Based on the analysis of operation characteristics fault direct-drive permanent magnet wind turbine and existing protection strategies, in order to improve low-voltage capability turbine, a new coordinated control strategy for crossing is proposed this paper, which includes DC brake system unloading circuit, double second-order generalized integral phase-locked control, extracting positive nega...

Pulse-width modulated (PWM) adjustable frequency drives (AFDs) are extensively used in industries for control of induction motors. It has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. Hence, overshoots, high rate of rise, harmonics and transients are observed in the voltage wave. They increase voltag...