In this paper, a new control algorithm for the dynamic voltage restorer (DVR) is proposed to regulate the load terminal voltage during various power quality problems that include sag, swell, harmonics and unbalance in the voltage at the point of common coupling (PCC). The proposed control strategy is an Adaline (Adaptive linear element) Artificial Neural Network (ANN) and is used to control a c...

Multilevel inverters are an emerging area of research in the field power electronic circuits and applications. It has many advantages like near-sinusoidal output voltage, lower total harmonic distortion (THD), reduced dv/dt stress, peak inverse voltage (PIV) so on. But there some associated problems as well such cost, size complexity, capacitor unbalance voltage. Here a novel nine level inverte...

In this paper, direct power control (DPC) of three-phase pulsewidth-modulated rectifiers without line voltage sensors is presented. The new system is based on virtual flux (VF) estimation. Theoretical principles of this method are discussed. The steady-state and dynamic behavior of VF-DPC are presented that illustrate the operation and performance of the proposed system compared to a convention...

Voltage sags in the electric power system are mostly due to faults in the power system. Voltage sag is characterized by its magnitude (the retained voltage), phase-angle jump, unbalance in the sag in the three phases, and duration. Type of transformers in the electrical system is the important parameter influencing the characteristic of sag at the node where sensitive loads are connected. For s...

Due to the wide spread of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the ac mains currents has became a major concern due to the adverse effects on all equipment. Power electronic converters are commonly used for interfacing distributed generation (DG) systems to the electrical power network. However, the unbalanced voltage compensatio...

with increase in traffic and speed railway became one of the major load on supply grid .AC-DC convertor used in locomotive of traction system draws rich harmonics content current results in poor power quality and failure or missed operation of utility causing derating of grid and affect the reliability. This paper provide framework for issue like harmonics, voltage sage ,voltage unbalance, poor...

The modular multilevel converter of the battery energy storage system (MMC-BESS) not only is suitable for large-scale and dispatching AC DC grids, but also has a strong ability to suppress power fluctuations caused by new output or grid failures. When an asymmetric voltage sudden change in load occurs grid, order compensate difference between sides, submodule MMC-BESS will have large unbalanced...