A Novel Four-Level Voltage Source Inverter—Influence of Switching Strategies on the Distribution of Power Losses

Neutral points voltage balancing control of a four-level π-type converter

“…Once an optimized zero-sequence signal is selected, J can be minimized (ideally reduced to zero) when the capacitors' voltages are regulated at the reference value of 1/3 of the total DC-link voltage. To simpligy control implementation, it is better to calculate the derivative of (4) as shown in (5). When capacitor energy is minimized, the value of (5) becomes negative.…”

“…Converter topologies that generate output voltages of more than three levels have been studied [4,5]. An alternative four-level π-type converter was introduced with only six switching devices per phase leg [6].…”

Energy conversion unit with optimized waveform generation

“…Due to the growing demands for reliable electrical energy resources and abundant requests for high efficiency devices, numerous research groups are studying and developing new solutions and technologies to achieve high performance power converters [18]. In this context, a multilevel converter is an interesting alternative for power conversion, since it allows efficient power supply, suitable for high voltage and high power applications [14,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Analysis of the single-phase photovoltaic grid-connected cascaded H-bridge multilevel inverters

“…The multilevel converters (MLI) accomplish switching of high-voltage with sequences of voltage stages. MLIs can be essentially utilized in applications of medium systems or furthermore high power systems, like a compensation of static responsive power and also drives of adjustable-speed [7]. With a restrictions of the presently existing technologies of power semiconductor in these applications, a multilevel model is typically an exclusive alternative due to its cantered on switching low-frequencies with voltage supplying and current involvement among the semiconductor power [8].…”