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In this work it is presented a two-phase open-end winding induction motor (IM) driven by an improved current source inverter (CSI). The proposed inverter has independent full quadrant operation, lower DC-link current value, high magnetics power density, 25% more efficient and high AC output voltage waveform quality compared to conventional CSI solutions. A back-to-back AC-DC-AC current source converter...
In this work it is presented a generalized converter configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of a DC/DC-pulsating converter cascaded with a DC-link capacitor-less three-phase inverter. Due to the absence of a DC-link electrolytic capacitor, the presented inverter guarantees a long life-time and high power density. The DC/DC-pulsating...
This paper proposes possibilities of interconnected hybrid three-leg converters, that are comprise of combinations of two-level and/or three-level legs. In this way, four topologies are presented and compared in aspects such as harmonic distortion of grid currents, semiconductor losses and rating of power switches. The hybrid solution allows improvements in quality of the output converter voltages,...
In this work it is presented an AC-DC-AC synchronization technique that aims to reduce the DC-link current oscillation. The technique is applied to a reduced component count single-phase back-to-back Currente Source Converters (CSC). The deduction of how the DC-link oscillation is influenced by both input and output angles is presented. Experimental and simulation results are provided to validate...
A centralized power control strategy for regulating the voltage level at secondary power distribution network under high photovoltaic penetration level is proposed. The voltage and active power levels are received by a Centralized Control Unit (CCU) at which the optimal operating condition for minimizing both the absorption of reactive power and, when necessary, the active power curtailment. The real-time...
This paper presents two topologies of three-phase semi-controlled rectifiers suitable to open-end configured ac power sources. The rectifiers are composed by a combination of two-level three-phase bridges (controlled, semi-controlled ou uncontrolled), and three single-phase floating capacitor H-bridges. These topologies generate two powered dc-links, each one belonging to a three-phase bridge. They...
In this work it is presented a family of six single-phase Current Source Rectifiers (CSR) topologies with asymmetric structures. The topologies present reduced number of active switches and high power factor with low harmonic distortion. Three of the shown structures represent a simplification of full-bridge CSR, replacing two switches from the original topology by two diodes. The other three structures...
In this work it is presented a review of the Multilevel Current Source Rectifiers (MCSR), aiming to reduce the number of switches and inductors, thus reducing losses, cost and volume of the converter. Despite the removal of switches and inductors, the control and PWM ensures the correct operating of the converter. Simulations are presented to validate the effective operation of the topology for five-,...
This paper presents three-phase converter topologies for four-wire systems. The converters are series connected by three-phase transformers with accessible neutral. They possess a common dc-link, which is the power supply of the system, and two or more converters, where one of them is connected directly to the ac system, and the others cascaded through three-phase transformers. The three-phase transformers...
In this work it is presented a theoretical and experimental investigation of the influence of the low power oscillation due to the pulsating single-phase energy flow in a H-bridge voltage source inverter that operates connected to the grid and is fed by photovoltaic (PV) panels. That oscillation can be responsible for efficiency reduction of PV generators connected to the DC-bus of the inverter, as...
This work introduces a family of Current Source Converters (CSCs) that allows to control single-phase AC converters with two outputs independently sharing the same DC-bus. It is presented four different topologies which have their own advantages and disadvantages compared to each other. The comparison criterias are the total number of switches, the number of conducting switches per switching cycle,...
This paper proposes a shunt active power filter (SAPF) composed of four H-bridge converters. Each of them is connected by means of isolation transformers. Compared to conventional topologies, the proposed converter permits reducing: dc-link voltage rating, grid current harmonic distortion and/or switching frequency (switching losses). A suitable control strategy to adjust the filter currents as well...
This paper presents a evaluation of the transformerless Cascaded H-bridge (CHB) multilevel converter applied a large-scale photovoltaic (PV) plants. One the major problems in transformerless application is leakage current formed by the parasitic capacitance of the PV panels. This problem affect the security and quality of system. Most studies presents the solution based in common mode voltage, but...
This paper proposes a method of extracting the intrinsic parameters of a Photovoltaic (PV) generator by using Shuffled Complex Evolution (SCE) technique for a single-diode PV model. The characteristic equation of a single-diode PV generator presents a nonlinear behavior, which its solution to obtain the intrinsic parameters from an I × V experimental curve requires to use nonlinear optimization methods...
A design method based on the Diophan-tine equation is used for determining current controller parameters. The two main control objectives are: to put the closed loop poles in predefined locations;and to track the reference signal. The reference signal tracking problem is solved using the internal model principle. It introduces the reference generating polynomial into the controller design problem...
In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control multiple single-phase AC converters independently sharing the same DC-bus, with the advantage of having a reduced number of conducting switches, less switching and a lower DC-bus current. A conventional n-output/port single-phase CSC that uses the same DC-bus needs to have n H-bridge converters connected...
In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control two single-phase AC converters independently sharing the same DC-bus, with the advantage of having a reduced number of conducting switches, less switching and a lower DC-bus current. A conventional double single-phase CSC that uses the same DC-bus needs to have two two-legs (H-bridge) converters...
This paper investigates a power shunt filter composed by three standard three-leg converters, acting in three or four-wire system. Compared with the usual three-phase shunt filter, the proposed converter permits reducing the dc-link voltages, the harmonic distortion or/and the switching losses and being fault tolerant. Suitable control strategies to adjust the filter and circulating currents as well...
In this work it is presented a Current Source Converter (CSC) topology that helps to mitigate double line frequency power ripple (low frequency) effect. Low frequency power ripple presented in single-phase systems propagates through DC-bus converter. This low frequency ripple reduction allows to increase the power converter density by reducing the volume of the DC inductor, without lack of stiffness...
This paper presents an approach that allows to apply space-vector modulation strategy to eliminate common-mode voltage in multilevel inverters. The strategy is based on the reduction of the space vector diagram and on the choice of switching states in which the common-mode voltage is zero. Results were obtained with a real-time simulator and an experimental platform of a cascaded inverter up to 11-level...
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