Abstract
Multilevel inverter structures have the advantages due to the ablility to operate at high dc-bus voltage. It is able to operate at higher power applications by using series connection of switching devices. In addition, multilevel inverter can generate output voltage with very low harmonic distortion and synthesis a staircase voltage waveform by having multiple voltage levels. Various multilevel inverter topologies are introduced; however, cascaded multilevel inverter is commonly used because it is easy to be implemented. In addition, multilevel inverter topologies are able to operate at lower switching frequency and it produces higher efficiency by producing lower switching dissipation. In this paper, MATLAB/Simulink is used to model the seven levels cascaded multilevel PWM inverter by using bipolar and unipolar switching techniques. The analysis of the cascaded multilevel inverter will be done on different types of non-linear loads such as R-load, RL-load and RC-load The THD of voltages and currents on each type of loads that are done and finally the results are compared.
Highlights
Inverters are circuits that are used to convert the direct current power such as solar panels and batteries to alternate current power at a desired output voltage and frequency
The harmonic contents around the switching sidebands can produce mechanical vibration in electrical machines depending on their frequencies and magnitude, acoustic noise and overheating of the core of distribution transformers [2, 7,8, 12-13]
This section will explain the model of three phase seven level multilevel inverter modeling and unipolar and bipolar pulse width modulation (PWM) techniques
Summary
Inverters are circuits that are used to convert the direct current power such as solar panels and batteries to alternate current power at a desired output voltage and frequency. The harmonic contents around the switching sidebands can produce mechanical vibration in electrical machines depending on their frequencies and magnitude, acoustic noise and overheating of the core of distribution transformers [2, 7,8, 12-13]. They are able to generate output voltage and draw input current with very low distortion by increasing the number of output levels. Bipolar switched inverters are able to reduce low frequency harmonics especially at low power level [2]. If 0 ≤ ma ≤ 1, the fundamental output voltage is calculated as illustrated in (2) and (3)
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