Abstract
For the applications related to the medium/high-power/voltage, Multilevel inverters (MLI) are widely accepted and commercially used. The performance of MLI compare to the conventional two-level inverters is significantly superior due to the insignificant amount of harmonic distortion, lower filter size, requirement of low voltage rating devices, lower electromagnetic interference, etc. However, there are a few disadvantages such as an increased number of components, a complex modulation and control strategy, and issues related to the voltage balancing of capacitors. The present paper proposes a new topology with a lower voltage rating component to improve the performance by remedying the mentioned disadvantages. Compared with existing inverter topologies, (especially higher levels), this topology requires fewer components, fewer dc sources, and gate drives. Further, voltage stress is also low. The overall costs and complexity are therefore greatly reduced, especially for higher voltage levels. The proposed topology has been compared with other similar topologies and the comparison proves the better structure of the proposed topology. To show the working of the proposed topology, a prototype has been developed and tested for a different operating condition with two different modulation techniques. All the results show the adequate performance of the inverter topology at the different real-time environment.
Highlights
Multi-level Voltage Source Inverters (MVSIs), known as the ’Rising Power Converter’ has been used in a wide variety of high and medium voltage applications during the last decades
Compared with the conventional two-level topologies, this new type of DC-AC converter provides numerous advantages in terms of its high output voltage generation using lower voltage rating devices, lower dv / dt stress, low switching power losses, less input current distortions, and so on [1]–[4]. These attractive features together with the growth of power semiconductors have led to the interface between renewables photovoltaic systems and the utilities using MVSIs for various applications [5], [6]
The first multi-level topology with separate DC sources was established as a cascaded H-bridge (CHB) in the mid of 1970s
Summary
Multi-level Voltage Source Inverters (MVSIs), known as the ’Rising Power Converter’ has been used in a wide variety of high and medium voltage applications during the last decades. In [23]–[30], compact module topologies based on switched DC were evaluated in order to replace conventional MLIs. In this paper, a high level of inverter configuration has been proposed. The maximum blocking voltage of the switches of the LV module is given as VS6 = VS7 = 2Vdc. based on the above formulation, the TSV of HV and LV are given as: TSVHV = 2 (VS1 + VS2 + VS4) = {8 (m + 1) + 2} Vdc. From (2) and (6), the TSV of the proposed topology is given as TSV = {8 (m + 1) + 2} Vdc + 2 (2m + 1) Vdc. where Nsw, Ngd , and Ndc denote the total number of switches, gate driver circuits, and dc voltage sources respectively.
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