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A novel proposal of multilevel inverter is presented in this paper. The concept of the proposed topology is based on the association of Buck EIE converters in order to constitute a multilevel inverter and to provide an ac output voltage with low harmonic distortion and low voltage stress over the power semiconductor devices. The output voltage provided by the proposed multilevel is totally controlled...
Multilevel (multicell) converters are candidates of interest for power management applications requiring miniaturization -onchip integration- and/or bandwidth extension - wideband tracking -. This paper proposes a design-oriented model for predicting fast-scale instability occurrence in a 3-level (2-cells) converter, based on extending a ripple-based index previously validated for predicting fast-scale...
Compared with traditional load, power electronic load (PEL) has the advantages of flexible configuration and energy saving. After discussing the topology of singer-phase AC PEL, the design methods of main circuit parameters and control system are presented. And then, simulation waves of the system are given to show the feasibility and accuracy of the design.
The basic concept of a multilevel converter is to synthesize a staircase voltage wave-form by the use of several lower voltage DC sources. Capacitors, batteries, fuel cells and photovoltaic modules can be used as DC sources. A multilevel converter has several advantages, like a high voltage quality and low electromagnetic compatibility problems. Two different modulation schemes for multilevel inverters...
By integrating a novel voltage doubler rectifier with a classical current-fed converter, a current-fed push-pull boost converter with voltage doubler (CFBCVD) is presented. In addition to having a non-pulsating input current, recovery of the secondary leakage energy, low output capacitor current ripple, much lower rectifier diode voltage stress, and much higher voltage gain can be obtained. These...
A high voltage driving circuit having pulse mode is proposed for driving tubular field emission lamp (FEL). The employed main circuit topology, which is a flyback converter operated in discontinuous conduction mode (DCM), will not only provide a low cost negative pulse feature, but also eliminate the arcing phenomenon caused by traditional DC driving so as to improve the system efficiency and the...
In this paper, the soft switching technique is applied to the KY converter to upgrade the efficiency in the neighborhood of the rated load and hence enhance its capability in industrial applications. The details of soft switching of the KY converter are illustrated along with some simulated and experimental results to verify the effectiveness of the proposed control scheme.
Active front-end converters with bidirectional power flow capability have been extensively used for utility applications of power electronics, in which the hybrid type with coupling capacitor in series connection is receiving much attention due to its low operating voltage and low switching ripples. This paper proposes an improved control strategy for hybrid active front-end converters in grid-connected...
This paper proposes a novel single-phase to three-phase power converter, which based on current-fed topology. The proposed power converter doesn't require electrolytic capacitor and large inductance reactor. The proposed control method obtains high power factor operation and variable speed control for IPMSM. By using boost voltage characteristics of the proposed converter, the converter controls high...
This paper proposes a novel soft-switching two-phase boost converter to behave as a power factor correction pre-regulator. This regulator is able to turn on both the active power switches at zero voltage to reduce their switching losses and evidently raise the conversion efficiency. The two boost converters are identical, and their operation analysis and design for the regulator become quite simple...
A power conversion system in a wind turbine using a Permanent Magnet Synchronous Generator (PMSG) is directly connected between a generator and a grid. The capacity of power semiconductor switches and filters should be selected regarding the overall system rating and the output power quality. The use of an LCL-filter and n-parallel power conversion devices can be the best solution for these problems...
The aim of this paper is to estimate the capacitor's voltages by tacking the hybrid behavior of the multicellular converter into account. A nonlinear finite time observer is given in order to solve this problem. The stability and properties of the proposed homogeneous finite time observer are studied using Lyapunov theory. Our approach enables the stabilization of the observation errors in spite of...
This paper presents a new control strategy for a high performance hybrid cascaded H-Bridge HB multilevel converter with integrated series Active Power Filter Stage APFS. Unequal DC voltage sources are used to energise the converter's HBs. This offers increased number of voltage levels using fewer number of series connected HBs. Simple hybrid stair-case/SVM modulation strategy is proposed to synthesise...
In this paper, a novel dual-output boost converter with positive and negative output voltages under a single positive voltage source fed. Due to its dual output with positive and negative output voltages, this converter is very suitable for driving the half-bridge class-D amplifier, so as to remove a blocking capacitor required in the half-bridge class-D amplifier. Firstly, the basic operating principles...
The modular multilevel converter is a promising converter technology for various high-voltage high-power applications. Despite the apparent simplicity of the circuit, the inherent dynamics of the converter and the balancing of the sub-module capacitor voltages impose high requirements on the control system, which can be implemented in quite different ways. To illustrate this, and to provide a guidance...
In this paper, a novel dual-output buck-boost converter with positive and negative output voltages under a single positive voltage source fed. Due to its dual output with positive and negative output voltages, this converter is very suitable for driving the half-bridge class-D amplifier, so as to remove a blocking capacitor required in the half-bridge class-D amplifier. Firstly, the basic operating...
The use of the fluorescent lamps without electrodes (electrodeless) has been increasing, because of their features such as lifetime and lumen efficiency, when compared to conventional fluorescent and high pressure sodium (HPS) lamps. This paper presents a luminous flux variation strategy using a Single Ended Primary Inductance Converter (SEPIC), which also provides high power factor correction, to...
In a modern electrical power system, most of equipments have dc terminals as an interface or inside of them, but the electric power is distributed by ac. Therefore, they have to employ a power converter suitable for their circumstances to trade the electric power. However, as the converters cannot avoid conversion losses inherently, it is important to reduce the number of power conversion from an...
Multilevel converters and inverters have become the enabling power conversion technology for high voltage high power applications in today's power systems and large motor drives. Although the neutral-point clamped (NPC, a 3-level) inverter was invented in 1979, the multilevel concept was not formally established until the early 1990s when the diode-clamped multilevel inverter, the capacitor-clamped...
The inner control of a Modular Multilevel Converter (M2C) must be designed so that the submodule capacitor voltages are equalized and stable independent of the loading conditions. It has been shown that a submodule selection mechanism, included in the modulator, can provide voltage sharing inside the converter arm. Several procedures for controlling the total stored energy in each converter arm exist...
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