Multilevel converters are powerful converters in the medium-voltage high-power range. Inside this family of converters, the three-level neutral point clamped converter has its own importance. The main control methods associated with this converter are the carrier-based PWM with added DC components and the space vector PWM. Two of the most important features of the NPC converter are the neutral ...

This paper investigates a novel single stage AC–AC power conversion, as an alternative to multistage AC– DC–AC power conversion topology, for interfacing the wind energy conversion system (WECS) to a grid as a distributed load system. A comprehensive dynamic model of proposed AC–AC converter is developed to satisfy all the functions of the converter. A new time switching pattern and a control m...

The developments in power electronics technology have led to the developments in the wind energy conversion system (WECS). The output voltage of the WECS depends on the speed of the wind, which is not constant. Hence, a power conversion unit is required to maintain the output voltage of the WECS constant. This paper presents the design of a boost converter and a voltage controller for maintaini...

This paper presents an implementation of open loop and closed loop control of Quadratic boost converter using PID controller.  Quadratic boost converter consists of boost converter and fly back converter driven by a single switch. Quadratic boost converter QBC is designed especially for regulating the DC interface between various micro sources and dc-ac inverter to electricity grid. Quadratic b...

Abstract The global warming of the planet is as a result human activities. Fossil fuel depletion and its high prices have caused worldwide economic instability; governments around world turn to alternative energy sources that are pollution-free. Solar photovoltaic system one biggest renewable resources generate electrical power fastest growing generation in world. objectives this work are: ensu...

A method of modeling PWM switches for symbolic analysis of pulse-width-modulated (PWM) dc-to-dc converters operating in the continuous conducting mode (CCM) is described for switches with both fixed and modulated duty ratio. The well-known average models of PWM switch according to Vorpérian are implemented by means of modified nodal analysis into the SNAP program to analyze transfer and immitta...

LEDs lights have numerous advantages as compared to conventional lighting sources and are becoming popular these days. Depending upon the application requirement brightness of the LEDs needs to be controlled. The brightness is controlled by controlling the forward current flowing through the LED. In this paper, different techniques used for dimming the brightness of LED lamps are reviewed. DC-D...

This topic discusses the trade-offs between fixed-frequency pulse-width modulation (PWM) and pulsefrequency modulation (PFM) for portable DC/DC converter applications. PWM converters offer the benefit of predictable operating frequency, which may simplify the design of circuitry that suppresses electromagnetic interference (EMI). They also offer low output ripple characteristics and high effici...

The paper presents design and performance evaluation of two-stage ac adapters for notebook computers which deliver 70 W from the universal line. Three versions of the flyback converter, as well as the PWM and resonant half-bridge converter were evaluated and compared with respect to their efficiency, component stress, output filter size, and complexity.