This paper proposes an improved Z-source inverter topology. Compared to the traditional Z-source inverter, it can reduce the Z-source capacitor voltage stress ignificantly to perform the same voltage boost, and has inherent limitation to inrush current at startup. The control strategy of the proposed Z-source inverter is exactly the same as the traditional one, so […]
Capacitor Balance Issues of the Diode-Clamped Multilevel Inverter Operated in a Quasi Two-State Mode-Matlab-Power Electronics-2008
A new operational mode for diode-clamped multilevel inverters termed quasi two-level operation is proposed. Such operation aims to avoid the imbalance problem of the dc-link capacitors for multilevel inverters with more than three levels and reduces the dc-link capacitance without introducing any significant voltage ripple at the dc-link nodes. The proposed operation can be generalized […]
Switched-Capacitor/Switched-Inductor Structures for Getting Transformerless Hybrid DC–DC PWM Converters-Matlab-Power Electronics-2008
A few simple switching structures, formed by either two capacitors and two-three diodes (C-switching), or two inductors and two-three diodes (L-switching) are proposed. These structures can be of two types: “step-down” and “step-up.”These blocks are inserted in classical converters: buck, boost, buck–boost,C´ uk, Zeta, Sepic. The “step-down” C- or L-switching structures can be combined with […]
Photovoltaic Parallel Resonant DC-link Soft Switching Inverter using Hysteresis Current Control-Matlab-Power Electronics-2010
This paper proposes a photovoltaic parallel resonant dc-link soft switching inverter using hysteresis current control.The proposed system includes a dc-link switch for soft switching. When the dc-link switch is turned off, the inverter switches are turned on and off with zero voltage switching using hysteresis current controller. So, all of the switches in the proposed […]
Dead-Time Elimination for Voltage Source Inverters-Matlab-Power Electronics-2008
A novel dead-time elimination method is presented in this paper for voltage source inverters. This method is based on decomposing of a generic phase-leg into two basic switching cells, which are configured with a controllable switch in series with an uncontrollable diode. Therefore, dead-time is not needed. In comparison to using expensive current sensors, this […]
A Modified SEPIC Converter for High-Power-Factor Rectifier and Universal Input Voltage Applications-Matlab-Power Electronics-2008
A high-power-factor rectifier suitable for universal line base on a modified version of the single-ended primary inductance converter (SEPIC) is presented in this paper. The voltage multiplier technique is applied to the classical SEPIC circuit, obtaining new operation characteristics as low-switch-voltage operation and high static gain at low line voltage. The new configuration also allows […]
Quasi-Z-Source Inverter for Photovoltaic Power Generation Systems-Matlab-Power Electronics-2009
This paper presents a quasi-Z-source inverter (qZSI) that is a new topology derived from the traditional Z-source inverter (ZSI). The qZSI inherits all the advantages of the ZSI,which can realize buck/boost, inversion and power conditioning in a single stage with improved reliability. In addition, the proposed qZSI has the unique advantages of lower component ratings […]
A Hybrid Three Phase Current Source Rectifier For High Power Application-Matlab-Power Electronics-2009
This paper presents a novel hybrid three phase current source rectifier (CSR) that achieve unity power factor and low current THD for high power application. The rectifier is composed of a traditional six-pulse thyristor bridge and two controllable switches such as the isolated gate bipolar transistor (IGBT). The unity power factor and low current THD […]
Analysis and Implementation of a Hybrid High-Power-Factor Three-Phase Unidirectional Rectifier-Matlab-Power Electronics-2009
This paper describes the conception and analysis of a unidirectional hybrid three-phase rectifier suitable for mediumand high-power applications. The rectifier is composed of a single-switch diode bridge boost-type rectifier in parallel with a pulsewidth modulation (PWM) three-phase unidirectional boost rectifier. The objective is to obtain a structure capable of providing sinusoidal input currents with low […]
Comparison of Z-Source Inverter and Traditional Two-Stage Boost-Buck Inverter in Grid-tied Renewable Energy Generation-Matlab-Power Electronics-2009
Z-source inverter and traditional two-stage buck-boost inverter are compared with respect to the voltage stress and maximum current stress of semiconductor devices and the inverter efficiency in grid-tied renewable energy generation application. The operation principles of the two inverters are introduced firstly,considering the two different PWM strategies used in Z-source inverter. Based on the principles, […]
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