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This paper discusses the design and topology of the indirect matrix converter. The double space vector modulation technique (DSVPWM) is applied on the system and a unity power factor was accomplished along with desired sinusoidal input and output waveforms. The whole system is simulated using Matlab/Simulink, and the results prove to comply with the existing power quality standards.
This paper presents a new fault-tolerant strategy to guarantee the performance of three-phase multilevel (ML) converters with faulty switches. The proposed fault-tolerant strategy is based on the modified Space Vector Modulation (SVM) technique in conjunction with the Fundamental Phase-Shift Compensation (FPSC) method. In this paper, first a brief background about SVM and FPSC methods is provided...
Long-term-evolution (LTE) communication enables high data-rates but degrades the efficiency of the power amplifiers (PAs) due to high peak-to-average power ratios of transmitted signals. Envelope tracking (ET) and envelope-elimination-and-restoration (EER) techniques have been proposed to improve the PA efficiency by adapting the PA supply voltage to the envelope. Linear PAs in ET systems are mostly...
This paper presents a fast and robust control system for a three-phase quasi-Z-source inverter (qZSI) connected to the grid. The topology combines two quasi-Z-source networks with a T-type inverter allowing to obtain AC voltages with multilevel characteristics and properties of the referred networks. To control this system a closed-loop current controller for the AC currents is proposed. The controller...
This publication describes an novel fault tolerant converter for switch reluctance machines. It is proposed to take the advantages of multilevel output converter in the normal operation mode and exploit the switching states that are destructive for the conventional NPC topology and use them for fault tolerance. Moreover, simple and yet effective modulation technique has been found, modified and improved...
In recent years, the significant growth of the number of inverters connected to the grid as a consequence of the development of renewable energy sources, especially photovoltaic modules, has caused that focus is on innovative inverter circuitries. This paper presents a comparison between two different configurations of three-phase three-level inverters: the neutral-point-clamped and the T-type. Both...
Due to the increase of electrical power transferred in various fields, the multilevel voltage-source-inverters (VSI) gained high popularity during the last decade. Their ability to produce low harmonic distortion waveforms and reduced power losses led to the development of a large number of solutions and control methods. This paper presents some five-level (5L) VSI topologies with their main features...
This paper represents a method to enhance the linearity of an integrator by implementing feedback compensation topology. The proposed design reduces signal swing while keeping advantages of both feed-forward as well as feedback topology without changing the signal transfer function. Linearity is related to the output of an integrator. Non-linearity resulted because of the integrator's output swing...
Recently there has been an increasing interest in transformerless photovoltaic (PV) inverters because of their salient benefits such as lower cost, smaller volume as well as higher efficiency as compared to those with transformer. However, a higher leakage current will inherently flow from the PV array to the grid through the stray capacitance. The leakage current increases the losses as well as the...
The ability of Ethernet Ring Protection Switching (ERPS) to provide carrier grade switchover has made Ethernet technology viable in telecommunication carrier networks enabling network operators to replace SONET/SDH/PDH. Adaptive modulation (AM) is another evolution in technology which may effectively double the capacity of microwave links in favorable weather condition. In this paper, we propose an...
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...
In hybrid microgrids, integration of multiple renewable energy sources to AC and DC buses of grid require a boost and multi-level inverters. Depending on the requirement, these boost and multi-level converters are connected either in parallel or in cascaded. In this parallel or cascaded arrangement the device count and control complexity increases. And, also it requires a separate AC and DC output...
Matrix converters became very popular over AC-DC-AC converters for AC to AC conversion because of their beauty having no dc link capacitor. The gain of these converter can be varied only in the range of 0–86.6% of input voltage. This restricts its operation in high voltage application and also in grid integration. To enhance the boosting capability beyond the earlier one, this paper implements a switched...
A novel three-phase multilevel inverter using a single dc source is proposed in this paper, which uses flying capacitors for generating different voltage levels. Pole voltage levels can be of five levels or higher than that. The structural similarity of the front end of the proposed inverter with that of the three-level neutral-point clamped inverter and the presence of redundant switching states...
Emerging applications such as solar cells, fuel cells, energy storage, UPS, etc. require voltage gain and are low voltage high current specifications. This paper thoroughly studies and reviews high-frequency current-fed converters for low voltage high current applications. Hard-switching, dissipative or passive snubber based, active-clamped, naturally-clamped, impulse commutated, and parasitic assisted...
This paper discusses the integration of a three-phase Distributed generation (DG) into a grid-tied Photovoltaic (PV) system. A single-stage power conversion system comprising a Current Source Inverter (CSI) capable of dc voltage boost is proposed for this PV MIC system, to control which, a multivariable-proportional-integral (PI) regulator-based power control strategy is designed. It will control...
The concept of using passive components to get buck-boost operation from DC link, to reduce common mode noise and to limit inrush current had come into picture with invention of Z source inverter. X source structure was also proposed as a generic impedance source structure to achieve all aforementioned pros. This study proposes a novel reactance source (X source) structure to achieve the same results...
Multilevel inverters give a near sinusoidal output, thus avoiding the need of a bulky filter in the inverter output. This paper proposes a novel three phase three level multilevel inverter using switched capacitors. The operating frequency is 400Hz, thus enabling its usage in aircraft and aerospace applications. The circuit is simulated using MATLAB Simulink and results are analyzed. A prototype is...
This paper brings forward a hybrid converter derived from the Split-Pi converter, which can provide simultaneous ac as well as dc outputs from the same dc input. The proposed converter can work both as a step up and step down converter, whereas most of the available hybrid topologies work in step up mode only. The inbuilt property of shoot through protection in inversion stage, makes this converter...
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