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This article presents two methods for the compensation of harmonics generated by a nonlinear load. The first is the classical PI controller. The second is the modern controller by Fuzzy ogic Tyie-1. Both methods are applied to a shunt Active Power Filter (sAPF) based on a three-phase voltage converter at five levels NPC topology in series with P-Q algorithm. The results give us clear that the rate...
The conventional one cycle control cannot realize the function of eliminating harmonic component in the output voltage waveform of a cascaded multilevel inverter. To overcome these problems, this paper proposes a modified one cycle control(OCC) scheme based on a sample time staggered technique. Through the stagger of the sample time in the control system of cascaded units, the output voltage waveform...
This paper presents a novel rotation estimation approach based on 3D mesh representation of spherical images. Indeed, unit sphere is becoming a natural space for projecting images captured from the central cameras (conventional and non-conventional cameras, as omnidirectional camera) and obtaining the spherical images. The proposed method relies on representing the spherical images into a 3D space...
According to the principle of DC injection, the topology of a 12-pulse current source converter based on autotransformer is proposed. The Main bridge topology is a autotransformer, and each injection branch consists of a double winding reactor and a IGBT and a diode in series. DC injection could make the main bridge realize zero current switching and operate in four quadrants. The system control method...
Passive shunt harmonic filter banks have proven to be an effective method for reducing harmonic distortion in HV and EHV networks, while providing the necessary volt-ampere-reactive power support and voltage support. Previous work in this area has provided information regarding the design and application of harmonic filters as well as discussion of the different filter topologies that are typically...
The important features of modular multilevel inverters(MMLIs) are lower power dissipations in the switches, low harmonic contents, modularity and outputs with lower electromagnetic interference (EMI). The MMLI discussed is based on the half-bridge topology. A comparative study of two level VSI and 3, 5 level MMLI is discussed in the context of their total harmonic distortion in simulink models.
Mitigation of the Harmonics is one of the major needs for an ideal power system and it is demanded that it should ideally provide a balanced and pure sinusoidal three phase voltage of constant amplitude to the loads. This paper deals with split phase(2C),4-leg and three single phase H-bridges. The performance of all three topologies under an unbalanced non-linear load conditions evaluated with a detailed...
In this paper, a cost effective novel cascaded H-Bridge multilevel inverter topology is proposed. This topology is based on a cascaded connection of single-phase novel H-bridge converters with less number of components. When compared with the conventional multilevel converters, the number of DC voltage sources, switching devices, installation area, and converter cost is significantly reduced. For...
Diode and thyristor based solid state converters are preferred because of their high reliability in applications for bulk power conversion. These converters generally use Power diodes or SCR (silicon controlled rectifiers) which has non-linear characteristics. Due to this reason such converters generate highly non-sinusoidal currents at the power supply utility. As a result of distorted currents the...
This paper presents a comparative analysis of a cascaded multilevel power converter of 5 symmetrical levels, in the both sub-topologies: single DC source and separated sources. The comparison was performed by implementation the two prototypes that were tested without load, with resistive load and with load delay. The converters were feed by a PWM modulation with optimized harmonic content using a...
A mathematical model of series-parallel compensation topology for contactless power transfer system is proposed in this paper. The effect of harmonics is considered to model the system parameter. A fourier series analysis is used in mathematical modeling. An experimental set-up of series-parallel compensated contactless power transfer system is built in the laboratory to verify the proposed model...
This paper presents a novel hybrid modular multilevel voltage source converter suitable for HVDC applications. It has the advantages of other modular multilevel topologies and can be made more compact making it attractive for offshore stations and city infeed applications. The Operating principle of the converter and internal energy management are discussed with simulation results from a scaled medium...
A fifth and seventh order harmonic elimination scheme for IM drive with a multilevel dodecagonal voltage space vector structure using a single DC source is proposed in this work. Single DC source requirement makes four quadrant operation of the drive system simpler compared to the multilevel do-decagonal structures presented in literatures before. The space vector structure consists of six concentric...
In this paper, three different system topologies for a high performance electric vehicle drive are compared to each other. Next to the classical three phase permanent magnet synchronous machine in different connection schemes, also one topology containing a six phase machine has been included into the study. Suitable inverter topologies are discussed as well as the design of the multiphase winding...
This paper presents a new front end Modular Multi-Parallel Rectifiers (MMR) topology for three-phase systems with active DC link current controllers. Conventional three-phase diode rectifiers generate significant line current harmonics which affect power quality of distribution networks. Several passive and active harmonic mitigation techniques have been utilized to reduce line current harmonics....
This paper proposes the fundamental-frequency modulated novel six-level inverter topology for single-phase stand-alone photovoltaic (PV) system. It consists of a full-bridge inverter circuit with two pairs of anti-parallel connected switching devices, four diodes and three independent DC sources (PV modules) to obtain six level output. The theoretical discussion of proposed system is also supported...
Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED-ballast are important in order to improve the overall system. In addition, size and costs are relevant factors in the highly competitive LED market. The paper compares three...
Multilevel power conversion has been receiving increasing attention in the past few years for high power applications. Extensive use of these switching devices based power converters lead to injection of large amount of harmonics in the grid. This paper proposes design and simulation of six winding transformer for 36-pulse rectifier unit and selection of suitable phase-shifting of these windings to...
In this paper, two types of differential topology rectifier are studied and designed for RF energy harvesting at GSM1800 band 1.83GHz. The proposed differential serial rectifier and differential doubler rectifier are with odd harmonics suppression characteristics. Radial stubs are utilized to filter the output harmonics, which makes the rectifier more compact. The rectifiers with Schottky diodes (SMS7630)...
In this paper, a new reliable radio frequency (RF) rectifier topology with an enhanced operating power range is proposed. The presented RF harvester possesses an efficient RF to DC conversion ratio over an enhanced power range. A typical RF rectifier is initially optimized, and then the RF input is equally split into two branches. Splitting the input RF power improved the reliability and breakdown...
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