Sinusoidal PWM Based Cascaded H-bridge Five Level Inverter Using Fuzzy Logic Controller

THD performance of single phase five level inverter using proportional resonant and harmonic compensators current controller

“…If the cascaded multilevel inverter has k DC sources and number of H -bridge cells, it provides (2k + 1) levels to synthesize the AC output waveform. Following that, to form a five-level inverter (FLI), two DC sources and two cascaded H -bridge cells will be required [5][6][7][8][9][10][11].…”

“…It is also mentioned in [8] that all FLIs that has been developed present more than one diode and auxiliary switch with an extra control circuits. As an example, there are structures with two auxiliary switches and two anti-bidirectional diodes, with two other diodes through which the capacitors are discharged plus two DC voltage sources are combined together in addition to the single k cell structure [6][7][8][9][10]. In other structure, one additional switch, four diodes and either two DC sources or two capacitors across a boost converter are in used to realize the FLIs output voltages [8][9][10][11][12][13][14][15].…”

“…As an example, there are structures with two auxiliary switches and two anti-bidirectional diodes, with two other diodes through which the capacitors are discharged plus two DC voltage sources are combined together in addition to the single k cell structure [6][7][8][9][10]. In other structure, one additional switch, four diodes and either two DC sources or two capacitors across a boost converter are in used to realize the FLIs output voltages [8][9][10][11][12][13][14][15]. Because of the structures in the control circuit of five level inverters are complexed, few authors have presented on the control scheme [16][17][18][19][20][21][22][23][24], mostly on H-bridge inverters and FLI.…”

Novel single-phase five-level inverter utilizing digital counter control scheme

“…In all the FLIs developed using a single H -bridge cell [12] [24], there are the presence of one or more auxiliary switches and diodes with additional control circuits. For instance, in some schemes two auxiliary switches with two anti-bidirectional diodes, two other diodes through which the capacitors are discharged and two DC voltage sources have been deployed in addition to the single k cell structure [10], [16], [20], [21], [23]. In other schemes, one auxiliary switch, four diodes and either two DC sources or two capacitors across a boost converter have in addition to the single k cell been designed to realize the FLIs output voltages [12], [14], [18], [23].…”

“…This means that for a five-level inverter (FLI), two DC sources and two cascaded H -bridge cells are required [5] [10]. Where a multicarrier PWM technique is adopted for obtaining the cascade inverter switching signals, n − 1 carriers with same carrier frequency f c , and same peak to peak amplitude AC, are also required.…”