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

Abstract

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.

Seven Level Symmetric Cascaded H-Bridge Multilevel Inverter for Solar Photovoltaic System

“…A solar PV cell's P-V and I-V tendency is highly vulnerable on the photovoltaic irradiation character, as illustrated in figures 3 & 4. The photovoltaic irradiation in the process of a decision of the environmental variation possess on fluctuating, although supervision appliance is accessible a particular track this conversion also be able to vary the functioning of the photovoltaic cell to appropriate the prescribed load demands [30]. Higher is the photovoltaic irradiation, and the open-circuit voltage is elevated, which is expected to be inflation of photovoltaic irradiation.…”

A novel bidirectional modular multilevel inverter utilizing diode‐based bidirectional unit

“…The primary structures proposed for MLIs, which are known as classical structures or traditional structures, are divided into three main categories, including neutral point clamped (NPC) MLI, also known as diode clamped MLI; Flying Capacitor (FC) MLI; and cascaded h-bridge (CHB) MLI. [2][3][4] As the number of levels increases in the traditional MLIs, the number of switches and gate driver circuits increases significantly. Additionally, with increasing the number of levels, the number of capacitors increases significantly in NPC and FC structures, and the number of diodes rises rapidly in the NPC structure.…”

“…Different structures and control methods have been proposed for MLIs. The primary structures proposed for MLIs, which are known as classical structures or traditional structures, are divided into three main categories, including neutral point clamped (NPC) MLI, also known as diode clamped MLI; Flying Capacitor (FC) MLI; and cascaded h‐bridge (CHB) MLI 2–4 …”

A novel design of basic module‐based multilevel inverter for symmetrical/asymmetrical sources

“…In the case of inductive load, the diode used in the circuits is not able to provide a proper path for the reverse current. 18 The diode used as a replacement of switches in Sedaghati and Majareh 22 produces spikes in the output voltage waveform for low power factor load due to reverse current. The next advances in the MLI structures are based on the switched capacitor, which replaces the dc voltage sources by capacitor.…”

“…Designing of multilevel converter mainly focuses to minimize the semiconductor devices, dc-link voltage sources, harmonic content, cost, total standing voltage (TSV), and losses. 15,18 The number of semiconductor switches can be reduced by introducing discrete diodes in the structure. 9,[19][20][21] It also encourages a simple control scheme, but this diode-based structure is limited to handling highly inductive loads.…”