Improved wave shape-pattern performance using Phase Opposite Disposition (POD) method for cascaded multilevel inverter

Razi, Atikah; Wahab, Ahmad Syafiq Ab; Shukor, S. A. A

doi:10.1109/spec.2016.7846022

Cited by 8 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 12 shows the vibrations due to the spatial harmonics (tooth harmonics), which are the most significant as mentioned in Section 2 and its are clearly distinguishable with the sinusoidal power supply. The frequency of the spatial harmonic will be 𝜈 ± 1 as With the motor used, the harmonic frequencies of the vibrations produced by these tooth harmonics appear above values: 18±1 (17,19), and 36±1 (35,37) with p=2, s1=36. These vibrations will appear in all the graphs, since they are a consequence of the constructive characteristics of the machine.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Discontinuous PWM Strategy with Frequency Modulation for Vibration Reduction in Asynchronous Machines

et al. 2023

View full text Add to dashboard Cite

The aim of this paper is to present our research into the reduction of vibrations in induction motors. The use of power inverters results in the generation of electrical harmonics, which increase the level of the mechanical vibrations of electrical machines. To reduce these harmonics, we present a discontinuous pulse-width modulation (PWM) control strategy based on carrier-wave modulation applied to multilevel inverters. Using the proposed modulation technique, the amplitude of the electrical harmonics is reduced, as compared to other conventional techniques. These current harmonics produce the MMF (magnetomotive force) harmonics in the air gap, which are one of the main sources of vibrations. The control strategy makes it possible to vary the electrical spectrum at the output of a multilevel inverter by modifying a control parameter of the carrier wave in the PWM, thus avoiding the natural frequencies of mechanical resonance. The proposed technique also has the feature of attenuating the total harmonics distortion of the voltage of the multilevel inverters, as well as the achievement of a higher RMS value of the output voltage for the same DC level. Laboratory results for an induction motor with different modulation strategies, applied in a multilevel inverter and compared to the strategy presented, are attached.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it enables the attainment of multiple levels using minimal components. These alleviate switching losses in the utilized devices, thereby augmenting circuit reliability and efficiency [17]. Consequently, this topology finds extensive utilization in industrial applications [6].…”

Section: Introductionmentioning

confidence: 99%

Discontinuous PWM Strategy with Frequency Modulation for Vibration Reduction in Asynchronous Machines

et al. 2023

View full text Add to dashboard Cite

show abstract

“…In addition, the CHB inverter makes it possible to reach many levels with minimum necessary components. These components mitigate the switching losses of the devices used and increase the reliability and efficiency of the circuit [15]. Therefore, this topology is widely used in industrial applications [4].…”

Section: Introductionmentioning

confidence: 99%

Pulse-Width Modulation Technique With Harmonic Injection in the Modulating Wave and Discontinuous Frequency Modulation for the Carrier Wave for Multilevel Inverters: An Application to the Reduction of Acoustic Noise in Induction Motors

2023

View full text Add to dashboard Cite

An implementation of a harmonic injection pulse width modulation frequency-modulated triangular carrier (HIPWM-FMTC) control strategy applied to a multilevel power inverter feeding an asynchronous motor is presented. The aim was to justify the reduction in acoustic noise emitted by the machine compared with other strategies in the technical literature. In addition, we checked how the THD at the inverter output was reduced compared to the other control techniques used as a reference. The proposed strategy is based on frequency modulation of the triangular carrier. The main advantage of the proposed method is that only one control parameter is required for modifying the electrical spectrum. Therefore, the mechanical natural frequencies and spatial harmonics of the machine can be avoided, and acoustic noise can be reduced. The effectiveness of the technique was demonstrated after laboratory validation by comparing the acoustic results for a 1 kW motor. The results obtained from the laboratory tests are presented and compared with those of other acoustic measurements using different PWM strategies.

show abstract

“…For asymmetric cascaded multilevel inverter topologies with different DC power supply voltage levels, it is difficult to output an ideal multilevel voltage waveform only by the modulation strategy of phase shift PWM (PS-PWM) [12] or phase disposition PWM (PD-PWM) [13]. Hybrid frequency PWM (HF-PWM) technology has emerged at the historic moment, which can enable switching devices of different voltage levels to work together in the same topology, so the characteristics of each switching device can be fully utilized.…”

Section: Introductionmentioning

confidence: 99%

Modified Modulation Strategy of 1: 1: 2 Asymmetric Nine-Level Inverter and Its Power Balance Method

Wei

Ren

et al. 2020

Electronics

View full text Add to dashboard Cite

The three unit nine-level inverter can output more voltage levels with fewer h-bridge units, while having better output waveform quality. However, in the conventional hybrid frequency modulation strategy, only one low-voltage unit adopts pulse width modulation (PWM), which causes the problem of switching loss and uneven heat distribution between the two low-voltage units. At the same time, the output power of the conventional modulation strategy is unbalanced. Aiming to resolve the above problems, a modified hybrid modulation strategy and a power balance control method under the strategy is proposed in this paper. The modulation strategy achieves output power balance between the three units and an even distribution of switching losses between the two low voltage units while maintaining the same output power quality. Simulation and experimental results verify the feasibility of the modulation strategy.

show abstract

Improved wave shape-pattern performance using Phase Opposite Disposition (POD) method for cascaded multilevel inverter

Cited by 8 publications

References 8 publications

Discontinuous PWM Strategy with Frequency Modulation for Vibration Reduction in Asynchronous Machines

Discontinuous PWM Strategy with Frequency Modulation for Vibration Reduction in Asynchronous Machines

Pulse-Width Modulation Technique With Harmonic Injection in the Modulating Wave and Discontinuous Frequency Modulation for the Carrier Wave for Multilevel Inverters: An Application to the Reduction of Acoustic Noise in Induction Motors

Modified Modulation Strategy of 1: 1: 2 Asymmetric Nine-Level Inverter and Its Power Balance Method

Contact Info

Product

Resources

About