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This paper presents the particle swarm optimization based harmonic elimination pulse width modulation (HEPWM) technique for three-phase voltage source inverter (VSI) to reduce predominant lower order harmonics at its output. The switching strategy of power semiconductor devices of VSI decides the nature of its output voltage. In this regard, the switching strategy can be broadly classified as lower...
This paper presents a selective harmonics reduction for a 3(n+1) shared switch inverter topology utilizing optimal arrangement of the n-modulated signal. Under different modulation indices and operating power frequencies the purpose of the proposed procedure is to select an optimal load connection and/or modulation offsetting based on the desired objective function. Three performance indices are studied...
This paper addresses calculation of current Total Harmonic Distortion (THD) for a three-phase two-level PWM inverter with an LCL-filter. Analytical approach introduced in late 1980s for a two-level inverter with inductance dominated load is generalized accounting for the smoothing effect of an LCL-filter. Though the obtained closed-form analytical solutions initially assume (infinitely) large ratio...
This paper presents an experimental study of the relationship between performance and total harmonic distortion (THD) in cascaded H-bridges multilevel power converters. The aim of the study is to determine the existence of a relation between the decrease of the output voltage THD and the reduction of the converter performance. In the work, a three-phase H-bridge cascaded multilevel converter is implemented...
In this paper, the performance of three-phase five-level neutral-point-clamped inverter using different carrier waves namely trapezoidal (T) and trapezoidal triangular (TT) with different modulation techniques applying three different modulating signals is studied. In this study, three basic level-shifted multicarrier PWM strategies namely, alternative phase opposition disposition (APOD), phase opposition...
Repetitive control (RC) scheme presents an attractive solution to achieve excellent steady-state tracking error and low total harmonic distortion (THD) for periodic signals. RC can produce extremely large gains at fundamental and each harmonic frequency of reference signal to achieve all harmonics suppression. However, a DC-AC inverter always has uneven THD distribution, e.g. THD concentrates at 4fc...
In this paper, a control scheme for stand-alone voltage source inverters using resonant controllers in the 2-phase stationary frame of reference with a zero sequence controller is proposed. The proposed control scheme reduces the number of resonant controllers while achieves the same performance as existing control methods. The total harmonic distortion (THD) of the output voltage is improved over...
Total harmonic distortion, produced with the existing PWM techniques for a Z-source inverter topology, is higher due to the unsymmetrical shoot-through, if separate controls of ac and dc sides are required. This paper proposes the concept of symmetrical shoot-through-based modulation and compares the performance with the case of the popular simple boost control. The proposed modulation method achieves...
Development of renewable energy has become crucial for the global warming and shortage of fossil fuel. Solar energy is one of the promising renewable energy to meet the energy crisis. One of the big disadvantage of solar array is the efficiency level remains between 14%–25%. So maximum power extraction and reduction of associate losses is a challenge for the researchers. Multilevel inverters are being...
This paper introduces a unique seven level five switch Inverter with different type of filters to reduce total harmonic distortion (THD) and suitable for renewable energy applications. In conventional inverters output voltage and current waveforms are very far from the sinusoidal shape due to high percentage of THD. This type of distorted output voltage is not suitable for industrial drives and renewable...
This paper presents the simulation of a Three Phase Five Level Cascaded H-bridge Multilevel Inverter. Third Harmonics Injection Pulse Width Modulation (THIPWM) technique was employed through s-function approach in SIMULINK environment to minimize the complexity of circuit design. The advantages of THIPWM are revealed in term of voltage and current THD reduction compared to Sinusoidal Pulse Width Modulation...
This paper presents the generalized solutions for nonlinear equations of pulse-width-modulation (PWM) switching technique in the cascaded multicell multilevel converters which are modulated under the selective harmonic elimination (SHE) method. The provided solutions are used to explore the total harmonic distortion (THD) of line-to-line voltages in three-phase cascaded multilevel converters. First,...
The article aims to investigate the influence of sub-modulating function form to the harmonic structure of output voltage and coefficient of power-supply voltage use in the systems with multilevel inverters. Comparative analysis for different types of modulation and different sub-modulating functions shows the advantage of multi-level inverter with APWM.
This article deals with the simulation of the power converter with voltage-source inverter and sine-filter. The repetitive control system was designed. The existing power converter has a control system which makes Fourier transform of the output voltage to inject these harmonics with opposite phase. The new proposed system based on repetitive controller which is much simpler and with smaller CPU load...
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.
This paper addresses calculation of current Total Harmonic Distortion (THD) for a single-phase multilevel PWM inverter with LCL-filter. Analytical approach introduced in late 1980s for a 2-level inverter with inductance dominated load is generalized for a single-phase multilevel inverter with an arbitrary number of voltage levels accounting for the smoothing effect of LCL-filter. Though the obtained...
The objective of this study is to investigate the various switching tables for performance enhancement of three-phase Pulse Width Modulated (PWM) rectifiers controlled by Direct Power Control (DPC). This study includes different lookup tables such as fast, slow regenerative fast and regenerative slow along with Noguchi's conventional lookup table. DPC has portrayed the benefits of simplicity, faster...
Rectification is a very common term in power electronics sector, where an AC signal is converted into a DC signal. But this process comes up with few problems, such as, distortion of input current. With high amplitude, the total harmonic distortion (THD) increases. To solve these problems, passive filtering is used to decrease harmonic distortion and to improve the nature of input current. But filtering...
A basic unit configuration which uses very less number of switches for obtaining an asymmetric multilevel inverter is proposed in this paper. Even and odd voltage levels at the output can be achieved by adding a conventional inverter bridge circuit to basic unit. Asymmetric configurations have different value of dc sources, so large number of levels will obtained at the output with reduced number...
This paper presents a new twenty seven level cascaded H-bridge multi level inverter for locomotives. This proposed multi level inverter can overcome the need for a large number of electronic switches when the number of level increased. This proposed topology increases the efficiency of the inverter by reducing the switching losses using pulse width modulation technique. Recently in Japan they developed...
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