Switch count reduced structure for symmetric bi‐directional multilevel inverter based on switch‐diode‐source cells

et al. 2021

Circuit Theory & Apps

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Multilevel inverters (MLIs) have made great strides in utilizing renewable energy and industrial applications compared to conventional two‐level inverters in terms of output voltage quality, smaller size of the output filter, and higher efficiency. This paper describes a new diode containing bidirectional topology for single‐phase MLI. This structure is presented to reduce the count of switches, isolated voltage sources, and drivers that can increase the number of output levels modularly. This converter, despite the use of diodes, can feed bidirectionally the low power factor inductive–resistive loads. The proposed structure has been designed to achieve a higher output voltage levels relative to the number of switches, drivers, and direct current (DC) voltage sources. Three different algorithms have been proposed to determine the values of DC voltage sources. To confirm the superiority of the proposed structure, a detailed comparison has been carried out with other MLI topologies. Then the proposed topology is simulated in Matlab/Simulink environment using the nearest level modulation technique. Finally, experimental results are presented to confirm the performance of the designed structure in symmetric and asymmetric topologies.

Section: Analysis Of the Proposed Multilevel Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A generalized diode containing bidirectional topology for multilevel inverter with reduced switches and power loss

Montazer

Olamaei

et al. 2021

Circuit Theory & Apps

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“…To eliminate the reverse current caused by the alternative diodes instead of some switches, two topologies have recently been proposed in Hosseinpour et al 15,16 These topologies do not have the reverse current and the voltage spike problems, despite using diodes instead of some switches, and can operate appropriately with low power factor resistive‐inductive loads. In these topologies, using a current sensor, the instantaneous current polarity is determined, and for current paths containing diodes, an alternative path is considered.…”

Section: Introductionmentioning

confidence: 99%

An improved switched‐ladder bidirectional multilevel inverter: Topology, operating principle, and implementation

Seifi

Babaei

2021

Circuit Theory & Apps

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Multi‐level inverters (MLIs) for medium or high power and voltage utilization have acceptable application in industry and are utilized commercially. The performance of MLIs is considerably preferable to traditional two‐level inverters due to their negligible harmonic content, small filter size, utilization of lower‐rated voltage devices, low electromagnetic interference (EMI), and so on. However, in the face of these many advantages, few disadvantages can be expressed such as more device count and a sophisticated control strategy. This paper presents an improved switched‐ladder topology to enhance the performance of multi‐level inverters by improving the above drawbacks. Compared to existing inverter topologies, the proposed extendable diode‐containing bidirectional structure requires fewer switches and driver circuits. The proposed topology is compared with other similar topologies, and its superiority is examined. Fundamental switching frequency modulation technique is utilized to obtain high‐quality output voltage waveforms with lower harmonic contents and reduced switching losses. This converter, despite the use of diodes, can supply the low power factor inductive‐resistive loads, bidirectionally. To demonstrate the performance of the proposed topology, in addition to simulation with the nearest level modulation technique, a prototype of the proposed structure has been implemented and tested. The results display the proper performance of the proposed topology in the real‐time environment.

“…A multilevel converter is a power electronic system that combines and produces a desired multilevel output voltage from multiple DC voltages as input (Majareh et al, 2019). Two-level inverters have disadvantages such as low-quality output voltage and current, high output power ripple, low amplitude of the fundamental component, low efficiency, high switching loss, higher dv/dt, high stress on power switches and high electromagnetic interference (Hosseinpour et al, 2020). Multilevel inverters have removed the mentioned disadvantages.…”

Section: Introductionmentioning

confidence: 99%

A switch-source cell-based cascaded multilevel inverter topology with minimum number of power electronics components

Seifi

Transactions of the Institute of Measurement and Control

Dejamkhooy

2020

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Multilevel inverters are a new generation of DC–AC converters at medium and high voltage and power levels. In this paper, a new single-phase cascaded multilevel inverter is presented. For this purpose, a new basic cell is presented at first. Then, the new multilevel inverter structure is yielded by series connection of these cells. The proposed new cell is only capable of generating positive voltage levels, and therefore, to produce zero and negative voltage levels, the proposed structure is constructed based on H-bridge module. In order to reduce the maximum blocking voltage especially on H-bridge switches, the cascaded connection of the proposed converter is investigated. A comprehensive comparison is carried out between the proposed multilevel inverter with the classical and recently introduced structures in terms of the number of switching devices, the number of drivers, the total blocking voltage of the switches as well as the loss and efficiency. The accuracy of the proposed inverter’s performance is simulated in MATLAB/Simulink in symmetric and asymmetric topologies for a 17-level and 23-level output voltage respectively, and then evaluated by the laboratory prototype.