Series H‐bridge with stacked multicell inverter to quadruplicate voltage levels

Abstract

In this study, a series H-bridge with stacked multicell inverter (SHSI) is suggested which is commonly suitable for a high number of steps and for generating all levels at the output associated with a low number of circuit devices including switches and related gate driver circuits for each switch. The main advantages of the suggested topology compared with traditional flying capacitor multicell and stacked multicell (SM) inverters are increasing the number of output voltage levels and the root-meansquare value as much as four times, and doubles compared with mixed stacked multicell inverter. SHSI is compared with the mentioned structures improving the output voltage harmonic contents and decreasing the number and rating of components thereby reducing the cost and installation area and decreasing the stored energy and rating of flying capacitors. These sufficiencies are obtained by adding only four low-frequency switches and a DC source to the traditional SM inverters structure. Provided simulation and experimental results certify the feasibility and good performance of the suggested inverter.

Reconfiguration of semi‐cascaded multilevel inverter to improve systems performance parameters

“…Since multilevel has been introduced, several switching methods are proposed which can be used for various multilevel inverters to increase efficiency and improve the inverters output waveform [17][18][19]. Advantages of multilevel inverters compared to two-level inverter configuration are good waveform quality, low electromagnetic compatibility, low switching losses, high-voltage capability, lower voltage ratings of devices and low-speed ratings of switches [20][21][22]. Despite the mentioned advantages, multilevel topologies have some disadvantages over the two-level inverters.…”

A new scheme of symmetric multilevel inverter with reduced number of circuit devices

“…For simplicity, when it is required to generate m -levels in output voltage, the number of required DC sources must be obtained using (3) Each switch requires a separate driver circuit to produce switching pulses, thus the number of driver circuits is equal to the number of power switches, too. So:…”

“…The number of output voltage waveform levels will increase as the number of input DC voltage sources increases, as well the waveform gets closer to sinusoidal. In comparison with 3 level inverters, the sinusoidal waveform of multilevel inverters can offer substantial benefits, including higher power quality, lower harmonic components, better electromagnetic interface, higher amplitude of fundamental component, higher efficiency, lower harmonic distortion, lower switching losses and lower dv/dt, that makes multilevel inverters viable alternative for most of applications [1][2][3][4][5][6][7][8]. In the last few years much interest have been on multilevel inverters that has led to, suggestion of many new contributions and new topologies and this is still a technology under improvements.…”

Asymmetrical Multilevel Inverter with Modified Absolute Sinusoidal PWM Technique for Sensorless Control of Induction Motor

“…Three CHBVSI cells produce 27-level output voltage depending on the structure (Vdc, 3Vdc, 9Vdc) type which is adopted and built by [10][11][12][13][14][15] applying optimization, selective harmonic elimination (SHE), and multi-carrier PWM techniques. The output phase voltage of multilevel voltage source inverter can be improved using different PWM techniques to get approximating sinusoidal waveform of the output voltage [16,17].…”