Fuzzy Logic Controlled Harmonic Suppressor in Cascaded Multilevel Inverter

Current source inverter (CSI) operates to output a specified ac current waveform from dc current sources. Talking about power quality, harmonics distortion of ac waveform is a problem of an inverter circuit. Generating a multilevel current waveform will have less harmonics content than a traditional three-level current waveform. In addition to non-ideal conditions of power switches, i.e. voltage drop in diodes, conductors or controlled switches, the performance of current controller applied in an inverter circuit will considerably affect the ac waveform quality produced by inverter circuit. This paper presents and discusses application of hysteresis current controller in the five-level H-bridge with inductor-cell current source inverter. The current controller performance was compared with the proportional integral current controller. Some test results are presented and discussed to explore the advantages of hysteresis controller in reducing the current ripple and harmonics distortion of output current.

Section: Introductionmentioning

confidence: 99%

Improving output current of inductor-cell based five-level CSI using hysteresis current controller

Suroso

Winasis

Priswanto

et al. 2021

“…In order to obtain higher power of inverter circuits, a multilevel inverter has been introduced. This multilevel inverter generates a multistep AC output waveform from a single or multi DC input power [13][14][15][16]. When the input power is a single or multiple DC voltage sources and the output is a multistep AC voltage, the power inverter is called as multilevel voltage source inverter [17,18].…”

Section: Introductionmentioning

confidence: 99%

A nine-level hybrid current source inverter using common-emitter topology and inductor-cell

Suroso¹,

Nugroho²,

Noguchi³

2019

<p>A different circuit structure of nine-level current source power inverter is presented and discussed in this manuscript. The proposed topology is based on the common-emitter inverter topology equipped with an inductor-cell circuit. The common-emitter inverter works as the main inverter circuits delivering a three-level AC current waveform. The inductor-cell circuit produces the intermediate output current levels for nine-level current output waveform. Proportional integral current controller was applied to regulate the current streaming thru the inductor-cell. Multi triangular carrier signals based sinusoidal pulse width modulation method was utilized to obtain a lower waveform distortion. The proposed nine-level inverter circuit was tested and examined. The test results verified that the new nine-level inverter circuit worked well producing a nine-level current waveform with less low-frequency harmonic components.</p>

Non-iterative Wide-modulation-index Switching-angle Calculation Techniques for 15-level Binary Cascaded H-bridge Multilevel Inverter

Soo¹,

Chye²,

Tan³

et al. 2017

Cascaded H-bridge multilevel inverter (CHBMI) is able to generate a staircase AC output voltage with low switching losses. The switching angles applied to the CHBMI have to be calculated and arranged properly in order to minimize the total harmonic distortion (THD) of the output voltage waveform. In this paper, two non-iterative switching-angle calculation techniques applied for a 15-level binary asymmetric CHBMI are proposed. Both techniques employ a geometric approach to estimate the switching angles, and therefore, the generated equations can be solved directly without iterations, which are usually time-consuming and challenging to be implemented in real-time. Apart from this, both techniques are also able to calculate the switching angles for a wide range of modulation index. The proposed calculation techniques have been validated via MATLAB simulation and experiment. Keyword:Asymmetric multilevel inverter Binary multilevel inverter Cascaded H-Bridge Multilevel inverter Non-Iterative