We have stacked subwavelength gratings (SWGs) on a single substrate to create a compact, integrated circular polarization filter. The SWGs consist of a wire grid polarizer and a broadband form-birefringent quarter-wave plate (QWP). Rigorous coupled-wave analysis was used to design the QWP for operation over the 3.5-5.0-mum wavelength range. The fabricated silicon broadband QWP exhibited a phase...

Power quality problem is t he most sensitive problem in the power system. The objective of the project is to reduce one of the power quality issue called “harmonics” using compensation technique. Shunt Active Power Filter (SAPF) is used to eliminate harmonic current and also it compensates reactive power. In this project, both PI controller and Fuzzy Logic Controller based three-phase shunt act...

In this work, we investigate grid-forming control for power systems containing three-phase and single-phase converters connected to unbalanced distribution transmission networks, self-balancing between converters, propose a novel balancing feedback that explicitly allows trade-off unbalances in voltage power. We develop quasi-steady-state network model analyze the interactions across transmissi...

The emergence of solar Photovoltaic (PV) generation has been one the biggest changes in Power Grid past decade. Such plants are generally inverter based and these devices known sources harmonics fundamental frequency ‘supraharmonics’ (distortion range 2 to 150 kHz). It long theorized that due factors such as response service transformers interface PV grid, impedance power system at point common...

This paper presents a grid interfacing inverter that compensates power quality problems and it can also interface renewable energy sources with the electric grid. The grid interfacing inverter can effectively be utilized to perform following functions: 1) transfer of active power harvested from the renewable resources; 2) load reactive power demand support; 3) current harmonic compensation at P...

Renewable energy sources (RES) are being increasingly connected in distribution system utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from this grid interfacing inverters when installed in 3-phase 4wire distribution systems. The inverter is controlled to perform as multi-function device by incorporating active power filter func...

Inverters designed using reduced active semiconductor devices can be of interest to the industry because of their lower cost and enhanced reliability linked to their less complex gating and control circuitries. In this paper a four switch three phase b-4 topology for the grid connected application in an effort to reduce the cost of the inverter is investigated. Admittedly, this topology warrant...

This paper presents a comprehensive study of peak-to-peak and root-mean-square (RMS) values AC current ripples with balanced unbalanced fundamental currents in generic case three-phase four-leg converters uncoupled interface inductors present all three phases neutral. The ripple characteristics were determined for both phase neutral currents, considering the sinusoidal pulse-width modulation (S...

The deployment of electric vehicle charging stations degrades the quality power in distribution grid. This article proposes an interval type-2 fuzzy logic controlled shunt converter coupled novel high-quality scheme for vehicles. system includes three-phase bidirectional front-end ac-dc pulsewidth modulation (PWM) converter, backend dc-dc PWM and three-wire static compensator. converters help t...