Fast closed‐form solution of line‐to‐line voltage total harmonic distortion for three‐level inverters

Multilevel inverters have recently been received more attention in the power industry. Two traditional types of multilevel inverters are multilevel voltage-source inverter and multilevel current-source inverter. Despite this widespread use, multilevel Z-source inverter (ML-ZSI) has not been regarded enough, because a unique approach to voltage control of ML-ZSI has not yet been presented. Besides, the phase voltage and its total harmonic distortion (THD) have not been calculated for ML-ZSI so far. This study proposes two new methods for the formulation of phase voltage in ML-ZSI. The first method is based on Fourier series analysis of the phase-voltage waveform, and the second utilises the staircase waveform of the phase voltage. In addition, two new methods are introduced for computing the phasevoltage THD in ML-ZSI: approximate method and waveform-integration method. Although the waveform-integration method leads to the accurate answer, using this method is more difficult than an approximate method. The detailed description of suggested methods and comparison with each other are presented in this study. Simulation and experimental results are also given to demonstrate the new features of the proposed methods.

show abstract

“…According to [21], the formula of the approximate method calculates phase-voltage THD, regardless of waveform type as follows…”

Section: Approximate Methodsmentioning

confidence: 99%

Formulation of phase voltage and calculation of its total harmonic distortion in multilevel Z‐source inverter

Pilehvar¹,

Mardaneh²,

Rajaei³

2015

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…2 ⋅ cos ϕ 2 (24) where ϕ 1 = tan −1 (ωL eq, 1 − (1/ωC eq, 1 )/R eq, 1 ) and ϕ 2 = tan −1 (ωL eq, 2 − (1/ωC eq, 2 )/R eq, 2 ) . Therefore, the total output power of the proposed inverter could be written by…”

Section: The Equations Of Output Power Of Invertermentioning

confidence: 99%

“…As a result, it could reduce the rate of devices and save construction costs of inverter while operating in high input voltage applications. Moreover, the use of three-level inverter could also reduce the total harmonic distortion of output voltage and current waveforms [22][23][24] comparing with two-level inverter. Although the THD v does not have directly an effect on induction melting loads, it has directly made the problem about harmonics losses in ferrite cores of HF transformer.…”

Section: Introductionmentioning

confidence: 99%

Implementation of two‐output three‐level series‐resonant inverter for induction melting application

Meesrisuk¹,

Jangwanitlert²,

Suwan-ngam³

2018

IET Power Electronics

View full text Add to dashboard Cite

This study aims to present a two-output three-level series-resonant inverter together with an implementation and experiments for an induction melting application. A three-level circuit is applied for each branch of inverter in order to decrease the voltage stress on switching devices. A phase-shifted pulse-width modulation (PSPWM) with variable frequency control is applied for providing and maintaining a zero-voltage switching condition over a wide load range. In addition, the PSPWM could provide symmetrical output voltage and current waveforms that result in decreasing the THD v and THD i of output waveforms and harmonic losses of high-frequency transformer cores comparing to other PWM schemes. Finally, the prototype was designed, built, and tested to verify the consistency between the experimental results and theories of the proposed inverter.

show abstract

“…In the literature [18] the precise LVTHD formulas for a three-level inverter with infinite number of switching degree is extracted. As a case study in [18] this aforementioned precise LVTHD formula with two switching angles are obtained, which are shown in (4) to (12).…”

Section: B Precise Line Voltage Thd Formulationmentioning

confidence: 99%

“…Also, the analytical approaches can be elicited to a valid expression, so extracting the precise formula of LVTHD is necessary. In literature [18] the precise formula of LVTHD is extracted for 3-Level inverter with infinite number of switching degrees, So, in this paper the precise formula of LVTHD is applied as a novel fitness function to minimize LVTHD. This novel LVTHD formula is a transcendental equation via switching angles.…”

Section: Introductionmentioning

confidence: 99%

Performing of the MPPSO Optimization Algorithm to Minimize Line Voltage THD of 3-Level Inverter

Vadizadeh¹,

Ghorbani²,

Afjei³

2013

IOSR-JEEE

Self Cite

View full text Add to dashboard Cite

Different modulation methods have been proposed to control the multilevel inverters. This paper focuses on the staircase waveform modulation for 3-level inverters with low switching frequencies. In this paper a novel solution along with a new robustness optimization algorithm is presented to minimization of Total Harmonic Distortion (THD) of the output line voltage of the inverter based on the Multi Population Particle Swarm Optimization (MPPSO). The MPPSO algorithm has a lot of advantages compared with a general optimization algorithm such as Genetic algorithm (GA). A comparison has been drawn between aforementioned techniques related to optimization. A new expression of fitness function is presented to optimization of Line Voltage THD (LVTHD) of 3-level Inverter. The advantages of fundamental frequency harmonic minimization and swarm intelligence are combined to improve the quality of output line voltage. The validity of the proposed method is proved through various simulation results by MATLAB software.

show abstract

Fast closed‐form solution of line‐to‐line voltage total harmonic distortion for three‐level inverters

Cited by 8 publications

References 17 publications

Formulation of phase voltage and calculation of its total harmonic distortion in multilevel Z‐source inverter

Formulation of phase voltage and calculation of its total harmonic distortion in multilevel Z‐source inverter

Implementation of two‐output three‐level series‐resonant inverter for induction melting application

Performing of the MPPSO Optimization Algorithm to Minimize Line Voltage THD of 3-Level Inverter

Contact Info

Product

Resources

About