Abstract
ABSTRACT:Â Multilevel inverters have been introduced as useful devices to connect between DC-AC systems. They are high quality output and cost benefit systems with a wide range of applications. Asymmetric multilevel inverters are a type of multilevel inverters with unequal DC link to create more voltage levels through fewer components. This paper presents new topologies of cascade multilevel inverter by a new module with a reduced component. Base module produces 13 levels by two types of unequal DC sources and 10 switches. Modular can be used to produce more and higher voltages levels. The designing of proposed multilevel inverter makes some preferable index with better quality than similar modular multilevel inverters, such as less semiconductors and DC sources, low switching frequency, creating of negative levels without any additional circuit, and module in cascade connections. Also, two cascade topologies are presented in the modular connections of the proposed module to achieve high and significant number of levels. Nearest level control (NLC) method as a switching technique is used in step changing levels for topologies to get more quality and lower harmonics. The presented module and cascade topologies are simulated by MATLAB/Simulink and are implemented by the experimental prototype in laboratory to validate the performance of proposed topologies in which simulated and experimental results show a good performance with the high quality output.
Highlights
Energy is a key concern to the world
The experimental test results based on module and cascade topologies show good performance to get more and higher levels by this creative topology
Inverters are coupled with devices of DC-AC connections
Summary
Energy is a key concern to the world. In the 1970s, during the energy crisis, renewable energy and other supplies of DC power became possible alternative sources of energy to replace carbon-based fuels. Multilevel converters are different arrangements of power electronic switches with DC links to create n-level waveforms on the output. In 1981, the first multilevel converter introduced was of the NPC type It could be used for medium voltage levels [8]. The design of asymmetric multilevel inverters considers many parameters: the number of levels, semiconductors and DC links, the amplitude of THD (Total Harmonic Distortion), the maximum voltage level, the creation of positive and negative levels, modular ability, and switch stress. In [12], the H-bridge is divided into sub-modules with two capacitors added for each DC source to find more levels without requiring more semiconductor devices. The module can be used as two cascade method connections and it does not need any additional circuit to create negative levels. Simulation and experimental results of the proposed topologies are shown in sections 4 and 5
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