Single Phase Asymmetrical Cascaded MLI with Extreme Output Voltage Levels to Switch Ratio

Self Cite

This paper aims to study the multi-level inverter (MLI) fed the widely used doubly-fed induction generators (DFIG). The new DFIG generator connected to the electrical grid is evaluated during single-pole autoreclosure operation to continue the generator support to the system. The effect of using MLI on the performance of the DFIG system during the dynamic operation of the autoreclosure is studied for the first time and integrating a new MLI during the fault and clearing periods. A dynamic arc model is represented depending on Kizilcay model. Furthermore, the dynamics performance of the DFIG during integration with MLI to improve the performance is studied. The MLI is preferred because of processing high power with high resolution of the voltage waveforms and lower stresses on switches. The MLI enhances the performance of DFIG-based generating system associated with electrical grid system in case of single-pole autoreclosure. The proposed cases of studies are simulated using Matlab/Simulink to evaluate the proposed system performance during the autoreclosure operation for faults in double-circuit transmission systems.

Section: Evaluation Of Dfig Integrated MLImentioning

confidence: 88%

“…Table 1 shows the switching states of this inverter topology. The idea behind chosen this inverter is that, only single dc source can be used for the main stage and the other 3 dc sources for the auxiliary circuits can be generated using a high frequency transformer (HFT) [25].…”

Section: Multi-level Inverters Designmentioning

confidence: 99%

Performance investigation of multi-level inverter for DFIG during grid autoreclosure operation

Ahmed¹,

Metwaly²,

Elkalashy³

2019

Self Cite

“…• The control signal of the 3.3 V or 5 V microcontrollers is not often enough. It is necessary to apply at least 8-12V to completely ignite the MOSFET which can cause their destruction [23].…”

Section: H-bridge With Drivermentioning

confidence: 99%

A smart cascaded H-bridge multilevel inverter with an optimized modulation techniques increasing the quality and reducing harmonics

Babkrani¹,

Naddami²,

Hilal³

2019

<span>The world community relied heavily on fossils energies but just after the big oil crisis the use of renewable energy has greatly increased and has become the main interest of many countries for its many advantages such as: minimal impact on the environment, renewable generators requiring less maintenance than traditional ones and it has also a great impact on economy. It is easy to get charmed by the advantages of using the renewable resources but we must also be aware of their disadvantages. One of the major disadvantages is that the renewable energy resources are intermittent and thus they have led scientists to develop new semiconductor power converters among which are the multilevel inverter. In this paper a new smart multi-level inverter is proposed so as to increase its levels according to the user’s needs and also to avoid the impact of shades and the intermittence on photovoltaic panels. We also propose a modification on the multicarrier aiming to reduce the harmonics. This modification introduces a sinusoidal wave compared with trapezoidal multi-carrier to generate the pulses. In order to obtain the line voltages and the total harmonic distortions (THD) MATLAB/SIMULINK is used.</span>

“…The advantages of the multilevel inverters are a) they can produce almost sinusoidal waveform output voltage with very low total harmonic distortion (THD), b) they can operate at low switching frequency [3], and c) they are applicable for high power and high voltage systems. There are commonly three types of multilevel inverter topologies: flying capacitor [4], diode-clamp [5,6], and cascaded multilevel inverter [7].…”

Section: Introductionmentioning

confidence: 99%

Optimization of SHEPWM cascaded multilevel inverter switching patterns

Hiendro

Yusuf

Junaidi

et al. 2020

Selective harmonic elimination (SHE) is an efficient method to eliminate low-order selected harmonics. However, due to nonlinearity in the problems, many optimization techniques give unsatisfied performances in finding optimum switching angles for the SHE. This paper proposes a modified moth-flame optimization algorithm to eliminate selective harmonics in cascaded multilevel inverters. The optimization algorithm is employed to find sets of optimum switching angles for cascaded 5-level, 7-level, and 9-level inverters. The results have shown that modified moth-flame optimization is beneficial in finding optimum switching angles. It performs better than moth-flame optimization (MFO) and differential evolution (DE) algorithms. The optimum switching angles are applied to generate switching pulses for a cascaded 9-level inverter to demonstrate the algorithm’s accuracy. As a result, the low-order harmonics are entirely removed from the ac output voltage of the inverter.