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This paper deals with the control design of an asymmetrical cascaded multilevel inverter. This structure therefore provides the capability to produce higher voltages at higher speeds with low switching frequency which has inherent low switching losses and high converter efficiency. Selective harmonic elimination(SHE) for asymmetrical multilevel CHB inverter control is proposed. The technique utilized...
A new three phase three transistor voltage source inverter has recently appeared in the literature which has attractive features compared to the conventional voltage source inverter topologies. In particular, it requires a less number of costly switching devices, such as high performance transistors. This inexpensive design is considered to be advantageous in medium to high power application requiring...
This paper describes a novel family of modified quasi-Z-source buck-boost multilevel inverters with reduced switch count. The inverters are derived by means of the modified inverter configuration with quasi-Z-source networks. The main benefits of the proposed solutions lie in the increased amount of levels with all possible sequences: reduced THD, reduced voltage stress on the transistors and size...
The matrix converter (MC) is an alternative ac-ac power converter by connecting directly input to output phases through bidirectional switches and without using any dc-link or energy storing element, therefore is called an all-silicon converter. Two topologies of matrix converter are established such as direct topology and the indirect topology. This paper is devoting to presents the topology of the...
As multilevel inverters are gaining importance, new topologies are being proposed especially for increased number of levels while reducing the number of power switches. In this paper, a level-doubling network (LDN) is proposed for the recently proposed ‘cross-connected sources based multilevel inverter (CCS-MLI)’ topology. While doubling the number of levels in the output voltage, the proposed LDN...
High efficiency and low Total Harmonic Distortion (THD) rectifiers have become a standard in the telecom industry. This paper describes the development of a digitally controlled Delta three-phase PFC to meet this standard. One way of improving efficiency is to reduce switching losses of the switching devices. This reduction could be achieved by modulation of the control output. This paper analyzes...
DC/AC converters are widely used in several applications; traditionally they can be classified in two types: the voltage source inverters (VSI) and the current source inverters (CSI). Their use depends on the application; however some of them are common for both types of converters. Other possibility for the DC/AC conversion is the multilevel configuration, there have been proposed different topologies...
This paper presents a unique control scheme for achieving power balancing in a recently proposed multilevel inverter topology. Moreover, this strategy can be extended to any type of topology and to any number of output levels of multilevel inverter (MLI). A comparison is made between the power delivered by sources with and without applying proposed strategy.
Due to voltage limitation of available semiconductor switches, multicell converters are required for high-power medium-voltage applications. One of the most significant types of multicell converters is cascade multicell converter categorized into symmetrical and asymmetrical ones. This paper first presents a new symmetrical cascade multicell converter in which the number of switches is optimized....
Low voltage direct current (LVDC) distribution is a new low voltage distribution concept. In this study, potential line and load converter topologies for a bipolar LVDC 1500 V distribution system are compared. It is possible to supply the LVDC network by one or two line converters and the line and load converters can be connected to 750 V DC or 1500 V DC. 12-pulse half-controlled thyristor bridges,...
Multi-pulses rectifiers are one of the technical solutions for harmonic mitigation in AC adjustable speed drives. 12-pulse, 18-pulse and 24-pulse rectifier topologies are used in various technical applications. The paper presents results from experimental measurements and results from simulations for two topologies of the eighteen-pulse rectifiers: with Dy1z1+200z1-200 and with Dd0diii0+200diii0-20...
This paper is on wind energy conversion systems with full-power converter and permanent magnet synchronous generator. Different topologies for the power-electronic converters are considered, namely matrix and multilevel converters. Also, a new fractional-order control strategy is proposed for the variable-speed operation of the wind turbines. Simulation studies are carried out in order to adequately...
This paper is on wind energy conversion systems with full-power converter and permanent magnet synchronous generator. Different topologies for the power-electronic converters are considered, namely matrix and two-level converters. Also, a new fractional-order control strategy is proposed for the variable-speed operation of the wind turbines. Simulation studies are carried out in order to adequately...
This paper presents a pseudo-differential zero-crossing-based circuit topology that achieves differential error suppression. The nature of the charging errors in different zero-crossing-based circuit topologies is explored and the benefits of the proposed topology are discussed. Simulation results provided confirm the differential error suppression in the proposed scheme.
Power converters consisting of naturally commutated thyristors such as cycloconverters and current source inverters were the first used in driving electrical motors with variable speed but now due to their inferior performance compared to forced commutated converters, their use is restricted in the high voltage/high power range where the performance and cost of forced commutated switching devices...
This paper discusses the design of a 60 GHz low noise amplifier (LNA) using a standard low power SOI CMOS process from ST Microelectronics. First, we outline the technology as well as the mm-wave design challenges. Using recent work on coplanar waveguide (CPW) modeling, we describe how it's possible to use parametric, 3D electromagnetic simulation to complete or replace analytical models of on-chip...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
In this paper, a novel topology for single-phase 7-Level inverter is introduced. Structural parts of the inverter are described in detail. Switching strategyand operational principles of the proposed inverter are explained and operational topologies are respectively given. A method and a formula are improved for calculating switching angles. The validity of the proposed inverter is verified through...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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