This paper presents the method of reducing torque ripple of brushless DC (BLDC) motor. The commutation torque ripple is reduced by control of the DC link voltage during the commutation time. The magnitude of voltage and commutation time is estimated by a neural network and optimized with an optimization method named particle swarm optimization (PSO) algorithm analysis. The goal of optimization ...

In this paper the two novel recurrent wavelet neural network (RWNN) controllers are proposed for controlling output direct current (DC) voltage of the rectifier and output alternate current (AC) voltage of the inverter. The output power of the rectifier and the inverter is provided by three-phase permanent magnet synchronous generator (PMSG) system directly-driven by permanent magnet synchronou...

Four-level neutral-point-clamped (NPC) multilevel converter topologies have been proposed and actively studied for low/medium voltage applications. As an inherent issue with these topologies, the balancing of dc-link capacitors is challenging, especially when it operates as a single-end inverter/rectifier high power factors modulation indexes. This article proposes closed-loop algorithm that ef...

It is normally assumed that the dc-link is a perfect constant dc voltage. However. in a practical system. it contains ripple components due to the rectification process. An analysis of the power conversion process shows that the power at the dclink consists of constant active power as well as a pulsating component that fluctuates at twice the mains frequency. When a VSI is powered by the fluctu...

This paper presents a new control structure to reduce torque ripple in switched reluctance motor. Although SRM possesses many advantages in motor structure, it suers from large torque ripple that causes some problems such as vibration and acoustic noise. In this paper another control loop is added and torque ripple is de ned as an objective function. By using fuzzy sliding mode strategy, the DC...

In this paper, a task-space controller for electrically driven robot manipulators is developed using a robust control algorithm. The controller is designed using voltage control strategy. Based on the nominal model of the robotic arm, the desired signals for motor currents are calculated and then the voltage control law is proposed based on the current errors and motor nominal electrical model....

The cascaded three-level neutral-point-clamped (3L-NPC) converter and the modular multi-level (MMC) are attractive solutions for medium-voltage direct-current (MVDC) applications. Due to their low cost compared MMCs, 3L-NPC converters have been adopted in ANGLE-DCa 30 MVA MVDC link demonstration project North Wales, UK. DC voltage imbalance across submodules (SMs) is a common challenge both typ...

Received Jul 15, 2016 Revised Mar 13, 2017 Accepted Mar 27, 2017 Interline Dynamic Voltage Restorer (IDVR) comprises of several Dynamic Voltage Restorers (DVRs) connected to different distribution feeders in the power system sharing common energy storage. One of the DVR provides for voltage sag compensation appearing in that feeder, while the other DVRs restore the energy in the common dc-link ...