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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...
The paper describes the simple technique for the quarter-wave symmetric output voltage waveform formation of the three-phase multilevel inverter. This technique is based on the applying the appropriate natural nonsymmetric three-segment vectors switching sequence to the recently proposed simple voltage source multilevel inverter space vector PWM algorithm. Some Mathcad simulated voltages waveforms...
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 seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter...
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...
In this paper the structure and principle work of electronic transformer scheme with intermediate elements of DC were discussed. Through simulation modeling time diagrams of this scheme were obtained. Assessment of the harmonic distortion input current and output voltage was held. Approximate calculation of the efficiency of the electronic transformer was carrying out.
This treatise deals with Transistor Clamped Five Level Inverter using Non-Inverting Double Reference Single Carrier PWM (NIDRSC PWM) Technique. Conventional or two level inverter have drawbacks like: i) Requirement of fast switching devices, ii) Very high dv/dt, iii) High Electromagnetic Interferences (EMI), iv) Bulky filters, v) Faster heating of switches, and vi) Not suitable for high voltage applications...
Progress in efficiency improvement has been main a matter in grid tie inverters. The employment of multilevel inverters in energy conversion promises a better power quality and lower switching losses than ordinary two-level inverters even in low voltage grid. This paper presents the implementation of several control schemes (Vector Oriented Control, Hysteresis Control) and modulation techniques (Pulse-width...
Aimed at the distortion problem of the inverter output current when LCL/LCC wireless power transfer system is under light load, an additional LC band-pass filter can lower the total harmonic distortion to achieve high-quality power transmission. Meanwhile, the output current can still be kept nearly constant and the system work is in totally resonant state. Simulated results indicate that the distortion...
In this paper, we propose low electromagnetic interference (EMI) high-k tightly-coupled resonant magnetic field (TCR-HMF) charger. The high coupling coefficient, k, between Tx and Rx coils is essential for increasing power transfer efficiency (PTE) and reducing size of proposed TCR-HMF charger. As the k increase, the mutual inductance also increases. Moreover, the larger mutual inductance results...
A single phase seven level inverter topology with fewer components using proportional integration controller is presented in this paper. The pulse width modulation is employed to generate gating signals for power switches. The proposed topology can be implemented for three phase application. The Separate dc sources can be replaced by solar PV arrays. The complete system is simulated using MATLAB/SIMULINK...
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 new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
Z-Source inverter has become main aspect for buck and boost inversion, where the boost gain is limited due to more component voltage sag and swell are high. To avoid these new quasi resonant inverter called Switched-coupled-inductor quasi Z-Source Inverter (SCL-qZSI) is introduced. This SCL-qZSI adds one capacitor, coupled inductor and two diodes compare to traditional qZSI. Switching stress can be...
This paper explores the implementation of Flying Capacitor Multilevel inverter (FCMH) using Phase Disposition Pulse Width Modulation (PDPWM) strategy as a control technique for providing gate pulses. Among the three types of MH, Flying capacitor type is chosen for its better advantages. This paper aims at constructing the FCMLI from its basic two level to the consequent levels for better understanding...
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...
Multilevel converter topologies have been receiving increased attention for medium and high power application in past years. This paper focuses on a new topology of 7-level multilevel inverter (MLI) named as improved H-bridge MLI (IHB MLI) with less number of switches than conventional type with 12 switches, which results in reduction of switching losses, switching stress and converter cost. This...
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