A New Multilevel Inverter Using Switched Capacitor Unit with Reduced Components

Multilevel inverters (MLI) are aligned with lower commutation losses and lower harmonics offer high power capacity. Requiring a more number of switches, their fundamental disadvantage is their circuit complexion, utilizing a H-bridge output. This exertion starts another multilevel inverter topology to organize with modular sort structure. To execute a multilevel output, the quantity of power devices for the new topology and voltage sources required to a given critical declination. Ti comprises of two fundamental parts in the proposed multilevel inverter structure. Delegated level and H-bridge module are the parts. Its simplicity of augmentation is the most unprecedented element of the framework. The inverter structure can prolong the quantity of level modules and integrate the cascaded efficiency expanded by expanding the number of voltage levels. The level module of diode and a dc source contains the semi conductor switches. The proposed MLI gives the unequal Dc sources of higher yield voltage and desired outcome. The proposed MLI demonstrating and simulation is done by utilizing MATLAB simulink. Super imposed carries pulse width modulations (SICPWM) are used by PWM techniques. In this closed control is accomplished for the topology utilizing fuzzy control. The rms voltage control is executed in the paper.

In this paper a novel topology of switched capacitor based multilevel inverters is proposed. In this topology, to increase the output voltage levels and to add the voltage boosting capability, several switched capacitor units are cascaded in series. Having voltage boosting capability and generating maximum number of output voltage levels using minimum number of circuit components, is a merit for this topology. To highlight the attributes of the proposed topology, it is compared with other recently proposed multilevel inverters on number of circuit components such as power electronic switches, diodes and capacitors, voltage boosting capability, total standing voltage, cost and efficiency. The comparison results verify the superiority of the proposed topology over other proposed topologies on number of circuit components, and number of output voltage levels. It is also clear that, this topology has lower voltage stress on power electronic switches, which makes it an appropriate solution for industrial applications. Finally, to show the capabilities of the proposed topology, and to verify the accurate operation of the topology, circuit analysis as well as the experimental results are provided.

In this brief, a new switched capacitor-based structure is presented for a single-phase multilevel inverter. The proposed structure is capable of boosting the input voltage and producing fifteen voltage levels at the output utilizing two separated DC voltage sources along with a switched capacitor unit. The proposed structure also has self-charging capability and can automatically adjust the capacitor voltage without any sensor. A quantitative comparison with similar structures has been performed to confirm the proposed structure. Furthermore, loss and thermal simulations have been performed for the proposed structure. The functionality of the proposed structure is examined by the simulation results. Finally, a laboratory prototype is implemented to verify the effectiveness and accuracy of the proposed structure and its control method.

A multilevel PWM voltage source inverter, especially a five-level one, is introduced to obtain a static var compensator (SVC) as a large scale power source. The multilevel inverter has many advantages, such as better utilization of the switching devices, lower switching frequency at each semiconductor switch and reduced harmonics. In this paper, the SVC with five-level inverter is modelled using circuit DQ transformation and completely analysed including DC and AC characteristics. It is also pointed out that the modulation indexes depend on the values of the DC side capacitors to meet the DC side voltage balancing, Finally, through the experimental results from a 5kVA SVC, the validity of the analyses and the feasibility of the var compensation system are shown for high power applications.

This article presents a revolutionary 7-level, nine-times voltage boosting property converter. The main disadvantage of traditional Multilevel Inverter (MLI) is that, in order to use renewable energy sources, a high-voltage DC-DC chopper must be tolerant of raise input voltage. The suggested converter makes use of ten switches, two inductors, four diodes, three switching capacitors, and just one DC supply. The capacitor’s voltage equalizes itself automatically. Less components are needed and a capacitor is used instead of a DC source to create the switched capacitor MLI. To produce the output voltage waveforms with seven levels, the switching Inductor/capacitor must be appropriately charged and discharged. Without requiring a voltage regulating circuit with a closed loop, the suggested inverter can self-balance the capacitor’s voltage. Because of the continuous series-parallel discharge and charging over a full cycle, three capacitors receive equal charges from the input source and the inductors. Compared to the majority of recently produced topologies, the suggested 7-level Switched Capacitor (SC) inverter involves a reduced number of switches, driver diodes, capacitors, also semiconductor switches. Additionally, four pairs of switches run simultaneously using the same control signal, simplifying the control system, and eight of the ten the fundamental frequency is used by switches to function. An elementary frequency switching system is employed to regulate the inverter’s output. On the PSIM/MATLAB platform, the suggested structure’s voltage-boosting and self-balancing capabilities are verified.

Reduced voltage stress across switches, stepped waveform and better harmonic profile make multilevel inverter a better choice over traditional inverter. However, the number of switches and other associated elements increase with the number of levels at the output voltage and results in increased size, cost and complexity. Many new inverter structures have been developed and modified to improve the level to switch ratio (LSR). This paper proposes one such improved single phase inverter topology. The proposed structure is corroborated by formulating a nine-level inverter. Further, the proposed structure is compared with the traditional asymmetric structure in terms of LSR.

This study presents a novel topology for multilevel inverters so called cascaded transformer reduced switches inverter (CTRSI). This topology consists of one DC source and several single-phase transformers. Each single-phase transformers generates three levels with two semiconductor switches and only two switches for all transformers alter the direction of single DC source. Whereas each single-phase transformers in conventional cascaded transformer multilevel inverter includes four switches. Hence, CTRSI has the advantage of a reduced number of components compared with conventional cascaded transformer multilevel inverter. Simulation results carried out by MATLAB/SIMULINK and a low-power experimental setup was planned to test the converter in practice. The results show that the proposed inverter topology is able to reach high-quality output voltages. Using switches with higher rating current than conventional topology is main disadvantage of CTRSI.

This paper presents a new five-level multilevel inverter (MLI) based on retrofitting of the conventional two-level (2L) three-phase inverter modules with minimum structural reconfigurations for low-voltage and high-power-quality demanding applications. It comprises two such inverter modules connected in series with 2L switched-capacitor units (SCUs). It requires only two isolated dc sources which are shared by all inverter output phases and thus eliminates the chances of output phase unbalance. Further, the voltage across the floating capacitors of the SCUs are naturally regulated without any sensors, thus makes the proposed topology more elegant for industrial applications. Further, an extensive comparison with the recent other MLI topologies attests the reduced requirement of the components in devising the proposed topology. Finally, experimental results from a low-power hardware prototype are presented to validate the feasibility of the proposed configuration.

Multilevel inverters (MLI) are commonly used for grid integration of renewable energy sources (RES) and for high-power industrial applications. MLI has excellent characteristics, such as high-level output voltage with minimal distortion of harmonics, meeting the requirements of power efficiency. General MLI topologies have a more complicated circuit, with more part numbers, high total cost and area of installation. This paper thus provides a synthesis of knowledge of the various topologies of the MLI and maps the knowledge gaps. The conceptual diagram with the switching sequence table and mathematical equations of the topology has been defined and also covers most of the newly formed MLI, and this paper has effectively outlined the useful information. The need for the hour, along with the required modulation method, is due to a huge number of power semiconductor switch and control circuit isolation, less electronic power switches and dc source. In this article, some of the configurations with less power switches and MLI configuration for induction motor drive are checked.

A Generalized WECS System with Single Phase Multilevel Inverter having MPPT control with Neural Network

This paper explores transformer less single phase multilevel inverter. The main objective of the paper are to find the operating voltage or peak power voltage for the pv panel (12v), to reduce the Total Harmonic Distortion level within 5% and to check whether the efficiency is to be increased to a certain level. The peak power voltage is the voltage that can be obtained when pv panel produces maximum power. To obtain this, Particle swarm optimization mppt algorithm is used to find the best value followed by several iterations. Evaluation results show that our model outperforms other models in nearly all metrics.

The focus of this paper is a theoretical calculation of current Total Harmonic Distortion (THD) for a current source single-phase multilevel PWM inverter with CL-filter. Analytical approach to current ripple mean square / current THD calculation was introduced in the 1980s for a 2-level voltage source inverter with inductance dominated RL-load. This paper presents a generalization of this approach for a single-phase multilevel current source PWM inverter with an arbitrary number of current levels accounting for the CL-filter effect. The output of this research is a closed-form analytical current THD solution. Though one of the assumptions is large switching-to-fundamental frequencies ratio, the formulas are practically accurate for the said ratio larger than 20-25. The formulas become quite compact and simple without a loss of accuracy when using a Bessel function approximation. They demonstrate a single-phase PWM current source inverter current THD dependence on CL-filter parameters and current modulation index.

Voltage Source Inverters (VSIs) are one of the most important power electronic converters in power industry. Generally, an inverter realizes a desired AC voltage with an arbitrary amplitude and frequency using a DC voltage source. The DC source can be a set of battery, an array of photovoltaic cells, fuel cells, and so on. In some applications such as photovoltaic systems, the voltage magnitude of the DC source needs to be boosted. In certain applications, e.g. the machine drives, a controller with a high bandwidth is required. In this regard, the slow output filters can be eliminated using a multilevel inverter. In this study, a comprehensive converter topology of a single-source boosting multilevel inverter is proposed to meet the above-mentioned requirements. Due to the above-mentioned features, the proposed inverter is referred to boosting multilevel voltage source inverter (BM-VSI). The suggested BM-VSI realizes a seven-level phase-to-phase staircase ac voltage using two DC-DC Cuk converters and only one DC source. The developed output voltage in the proposed BM-VSI is three times of the conventional voltage source inverter. The performance of the proposed topology is evaluated using a laboratory-scaled prototype.

For inverters, power quality is generally measured in terms of harmonic content and the magnitude of the ripple current. Current ripple for a conventional inverter is a function of inductor size, switching frequency and the number of discrete DC input levels (multilevel inverter). Zero average current error (ZACE) control provides low line frequency harmonics but requires high switching or a large inductor to provide low current ripple since only bilevel control is available. Modification of the ZACE concept is required to handle multilevel inverters. A new ZACE method is proposed that can handle the voltage transition in a single-phase multilevel inverter. Simulation results are presented for a grid-connected single-phase five-level inverter to demonstrate the concept.

Harmonic distortion presents a significant challenge in renewable energy integration, particularly in conventional 2-level inverters. Multilevel inverters, such as the cascaded H-bridge topology, offer an effective solution by generating multiple voltage levels, thereby reducing distortion and eliminating the need for bulky filters. This study investigates harmonic reduction in a single-phase 21-level asymmetric cascaded H-bridge multilevel inverter using a novel hybrid optimization algorithm combining Artificial Bee Colony (ABC) and Firefly Algorithm (FA). The hybrid ABC-FA algorithm is designed to determine optimal switching angles for minimizing Total Harmonic Distortion (THD) while addressing the limitations of conventional heuristic methods. Modeled and simulated in MATLAB/SIMULINK, the proposed algorithm demonstrates enhanced performance in both harmonic reduction and convergence speed. Simulation results show that the hybrid ABC-FA algorithm achieves THD levels below 5%, representing a 10–20% improvement over standalone ABC or FA implementations. Additionally, the algorithm exhibits faster convergence, highlighting its effectiveness and reliability for improving power quality and facilitating efficient integration of renewable energy sources into the electrical grid.