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This paper presents two selective harmonic elimination (SHE) and a mixed SHE-selective harmonic mitigation (SHM) procedures applied to 5-level inverter. The first one is a graphical procedure to control harmonic spectrum of a given voltage and/or current waveform. A fundamental frequency technique using a reference sinusoidal signal (RSS) to modulate the output voltage waveform v0 is applied, considering...
This paper presents a procedure that works at fundamental frequency to compute switching angles in single phase 9-level converters to eliminate the third and odd triple harmonics and to reduce other low order harmonics, obtaining a low total harmonic distortion (THD). The DC voltages feeding the converter, that are equal, but variable, allow to obtain switching angles independent on modulation index...
This paper solves harmonic elimination problem, and minimizes total harmonic distortion by a recently developed heuristics: moth-flame optimization method. 5th and 7th order harmonics are eliminated for a seven level cascaded multilevel inverter, and 5th, 7th, 11th and 13th order harmonics are eliminated for an eleven level cascaded multilevel inverter. Simulation results of a seven level cascaded...
This paper investigates about the impact of the number of levels and of the corresponding modulations angles on the mitigation of harmonics in cascaded H-bridge multilevel inverters. A mathematical model to reduce Nth odd harmonics from the output voltage of a multilevel converter is represented as a constrained optimization problem. It is further transformed in an unconstrained optimization problem...
The harmonic contents of the output waveform of the power converters is a very important factor in electrical power quality. In this paper a five-level cascaded inverter with unequal DC sources is considered and a selective harmonic elimination technique at fundamental frequency, based on the graphical separation of functions zeros, is considered to reduce total harmonic distortion in the inverter...
Selective harmonic elimination (SHE) is a widely used method to minimize the amount of total harmonic distortion (THD) in multilevel inverters. The main challenge associated with SHE method is to solve multiple variable high order nonlinear equations to obtain desired switching angles. To overcome this problem, a new online approach is provided in this paper which does not require solving complex...
Building Integrated Photovoltaic cell has become the emerging Trend in the area of power electronics and energy conversion. This paper pay attention on the interfacing of MPPT based Photovoltaic cell with Cascade Multilevel Inverter. Integrated Solar panel has efficiency losses due to rapid variation in light intensity and temperature of the panel. This control issue on PV side is handled by an efficient...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
Multilevel inverters have been widely used in medium and high voltage applications. Selective harmonics elimination for the staircase voltage waveform generated by multilevel inverters has been studied extensively in the last decade. Most published methods on this topic aimed at solving high-order multi-variable polynomial equation groups derived from Fourier series expansion. A totally different...
This paper presents a SVM implementation based on simplified decision trees (SDT). SDT-SVM applies SDT to the calculation of sector index and the duration of the adjacent switching state vectors, by which the none-linear calculations such as sin, atan and sqrt functions are avoided. This technique can be realized easily and reduces the computation time and improves the accuracy markedly. Further more,...
In this paper a novel algebraic real-time algorithm for implementation of sinusoidal pulse width modulation (SPWM) based on B-spline carriers is introduced and discussed. B-spline functions are used as carrier signals with the aim to to reduce harmonic content of the three phase inverter output voltage. This algorithm eliminates the problem of B-spline recursive evaluation with convolution integrals...
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