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The purpose of this paper is to provide low cost, high power quality and high efficiency solutions for grid-connected inverters. Compared with bipolar switched inverters, unipolar switched inverters have the advantages of higher efficiency due to reduced switching frequency and low iron losses of inductor in output filter. However, unipolar inverters produce large harmonic distortion due to the dead-time...
Distributed resources are finding increased penetration in developing countries like India. The increased acceptance of such resources is mainly due to their modularity, increased reliability, good power quality and environment friendly operation. These are currently being interfaced to the existing systems using voltage source inverters (VSC's). The control of such distributed resources is significantly...
Today, it is common the use of a static power converters to adapt the available energy from a clean source to feed an electrical load. Wind energy conversion systems have become one of the principal areas of research on renewable energies. This research has permitted the development of different topologies and control strategies of power converters to be used on wind energy extraction. This paper...
In this paper, On the basis of analyzing the model of three-phase PWM rectifier for wind power grid-connected inverter, the mathematical model of the vector decoupling controlled PWM rectifier at three-phase synchronous rotating coordinate system is deduced. This paper proposes a novel vector decoupling control strategy, which consists of two control loop, i.e. outer voltage loop and inner current...
This paper presents an analysis and the design of an off grid PV system for providing electricity for remote area. The system composed of dc-dc multilevel boost converter (MLBC) which is used for extracting maximum power from the cell. It has been chosen to generate three dc voltages at its output terminal. In addition to, a multilevel dc link inverter suitable for the generated dc bus voltages. The...
This paper describes a grid-connected photovoltaic (PV) system with the function of active power filter (APF), in which a Z-source network is employed to boost the DC bus voltage during periods when the PV array output is low. After modeling the Z-source network and H-bridge converter, a state space model of Z-source inverter is derived. The model reflects the fact that the Z-source inverter has two...
In this paper a novel algebraic real-time algorithm for implementation of sinusoidal pulse width modulation (SPWM) based on B-spline carriers is introduced and discussed. B-spline functions are used as carrier signals with the aim to to reduce harmonic content of the three phase inverter output voltage. This algorithm eliminates the problem of B-spline recursive evaluation with convolution integrals...
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