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A new modulation topology of seven level cascaded multilevel inverter fed with induction motor drive system with considerable reduction of semiconductors switches and DC voltage sources has been developed. In recent day's Multilevel inverter (MLI) technologies become an incredible main choice in the area of high power medium voltage control. There is hindrance in the vein of higher levels because...
A semi-dual-bridge resonant converter derived from the popular dual-bridge resonant converter (DBRC) topology is proposed in this paper for applications requiring only unidirectional power flow such as various types of DC power supplies, battery chargers in electric vehicles and dc-dc stage of different types of photovoltaic inverters. Based on the similarity of topology to the DBRC converter, the...
Multilevel inverters are preferred over conventional inverters as the quality of the output voltage improves with the number of voltage steps at the output. A new single phase cascaded multilevel inverter topology incorporating a new basic unit is proposed in this paper. Besides, seven different schemes are proposed to determine the magnitude of the dc sources. The proposed topology utilizes fewer...
This paper proposes a bi-directional isolated DC/DC converter for the battery charger and discharger of electric vehicles controlled by a new phase-shift topology. The proposed DC/DC converter consists of two full-bridge inverters, an isolated transformer, and boost reactors. The converter provides bi-directional transmission, buck-boost conversion and zero-voltage switching, adjusting the phase-shift...
For the independent DC link voltage control of the single phase cascaded multilevel PV inverter, this paper proposes an improved control strategy that consists only one total voltage loop and n feed-forward-based weighting factors. Actually, the multiple modulation signals have predictable ratios with each other because the series connection of the outputs of the H-bridges. Utilizing this feature,...
In this paper, an asymmetrical topology for cascaded multilevel inverter based on basic converter unit, series unit and full-bridge is proposed. It offers lower total harmonic distortion, switching losses and voltage stress on switches than conventional inverters. An algorithm to determine dc voltage sources magnitudes is proposed. The gating signals for the power switches are generated by employing...
Controllable ac sources, sometimes referred to as grid simulators, are becoming more common for grid integration testing of inverters as new grid interactive inverter functions develop. Due to the relatively niche application, high power grid simulators are often made by repurposing commercial drives with additional systems integration by the manufacturer or end user including filters, transformers,...
This paper suggests a design for a standalone photovoltaic (PV) system for house applications with a storage unit and an isolated full bridge bidirectional dc-dc converter scheme for controlled battery charging and discharging purpose. The maximum amount of power is extracted from the solar array in each and every step by controlling the duty ratio of the power MOSFET of the boost converter connected...
An existing Automated Trailer Machine (ATM) supply system consists of online UPS, generator, battery bank and grid connection. Because of this it is difficult to install ATM at remote areas, where these facilities are not available. Solar Photovoltaic (PV) powered ATM system is best solution for this problem. But existing off-grid solar PV system consists of several stages of power conversion which...
A family of single phase converters with reduced number of components is introduced in this paper. There are two switches, one coupled inductors and one capacitor in their structure, therefore the cost is reduced considerably. The proposed converters can be used as four quadrant DC/DC converter when fixed duty cycle (D) is applied to switches. On the other hand, they can be used as single phase inverter...
This paper deals with the design and analysis of new h-bridge based single and three phase cascaded multilevel inverter. It has two types of sources: symmetric and asymmetric source. In this topology asymmetric source is preferred because it provides large number of output voltage level with minimum number of switches. This new H-bridge based cascaded multilevel inverter is able to increase output...
The present work aims to remove dominant current harmonics (5th,7th,11th and 13th) of a 240V(rms) utility at the point of common coupling for the harmonically unbalanced condition of source current, using parallel combination of two shunt hybrid active filters. The harmonically unbalanced condition of source current has been created by connecting different types of non-linear loads in different phases...
Cascaded H-Bridge (CHB) Multi-Level Inverter (MLI) is widely known for their better performance. This topology is very widely used in renewable applications due to its advantage in the availability of isolated DC links. However, in MLIs the main constraint lies in the usage of switches, so as to avoid the switching losses. But, for the increase of CHBMLI to a next higher level of CHBMLI, the number...
Transformer-less photovoltaic (PV) systems have the advantages of higher system efficiency, reduced cost and size of the system. A single phase half bridge inverter topology does not inject dc into the grid, but its output voltage has only three levels, thus lower power quality. This paper proposes a transformer-less topology for improving the power quality of the inverter output voltage, and increasing...
In this paper, two topologies are presented for solar PV system, namely voltage lifting ZSI and voltage lifting Improved ZSI. These proposed inverters possess very high voltage boost. By replacing the middle diode in one of the switched inductor (SL) cell of SL-ZSI/2SL-qZSI with capacitor (CVL) high voltage gain can be obtained and also number of L, C and diodes gets reduced, which reduces weight,...
A major problem faced by systems having constant DC battery source, like hybrid electric vehicles is that supply voltage is weakened during higher speeds, thus limiting the system performance. A dual inverter fed open end winding induction motor can be used to mitigate this problem to an extend. In this paper, one of the inverters is fed using a floating capacitor, so that the supply voltage is maintained...
This paper evaluates different types of Hybrid multilevel topologies and is compared based on the number of components and output performance. The algorithms for obtaining the dc voltage values are briefed. Comparative analysis elicits the proposed topology for the better reduction of harmonics and reduced number of components such as dc voltage sources and switches in Hybrid multilevel inverter topologies...
Multilevel inverters generate a level output voltage from DC voltage sources. Requiring nice range of semiconductor switches is main disadvantage of structure inverters. The structure inverters are divided in 2 groups: symmetric and Asymmetric converters. The Asymmetric structure inverters give an oversized range of output steps while not increasing the quantity of DC voltage sources and elements...
This paper presents a simulation of 5-level Cascaded Diode Clamped Half Bridge (CDCHB) Inverter using Hybrid Level-shifted and Phase-shifted (HLP) Sinusoidal Pulse Width Modulation (SPWM) technique. The output voltage, output current and voltage across each device, and the THD of the CDCHB inverter are obtained. Further, the paper aims to perform a comparison between 5-level CDCHB inverter with Cascaded...
In this paper, a new circuit is proposed for step-up Z-source inverter based on QZSI (quasi-Z-source inverter). The proposed topology inherits all advantages of the conventional topology. The proposed topology in comparison with conventional topology reduces the ST (Shoot-through) duty cycle by over 25% at the same voltage boost factor. Theoretical analysis of the proposed qZSI in the ST and non-ST...
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