A novel switched capacitor-based multilevel inverter with symmetrical and asymmetrical configurations

Performance Enhancement of Reduced Component Multilevel Inverter with Optimal Placement of Level Shifter

“…The inverter circuit is developed with 8 uni-direction and 2 bi-direction switches connected with 5 DC voltage sources [16]. A 9-step and 21-step inverter is designed in [17] using the same value of source voltage ratio and unequal voltage ratio without the use of any extra circuit for inversion. The MLI circuit includes 12 switches and 2 voltage sources.…”

“…From the above discussions, a few advantages in design aspects are found from [9]- [18], where MLIs can be designed without including the inversion circuit at the load end to produce both positive and negative voltage steps, which results in considerable reduction in the switch count. The MLI design presented in [17] produces low standing voltages and the MLI structures proposed in [12], [17] and [18] require fewer DC sources in comparison with other inverter designs. It is found that the topologies proposed in [9], [10], [13] and [16] require a greater number of DC sources.…”

“…It is found that the topologies proposed in [9], [10], [13] and [16] require a greater number of DC sources. In [9], [17] and [18], the presence of capacitor necessitates extra attention to charge balancing and the presented MLI design in [10] and [15] needs a large variety of DC supplies, leading to higher TSV. Also, the MLI structure as shown in [13] utilizes a higher number of dual direction switches that leads to an increase in the total switch count.…”

“…), 𝑉 𝑏𝑙𝑜𝑐𝑘,𝑏 = ∑ 8(5 𝑢−1 )𝑉 𝑑𝑐 u 𝑞=1 (15) 𝑉 𝑏𝑙𝑜𝑐𝑘,𝑖𝑛𝑣 = ∑ 4(5 𝑢 − 1)𝑉 𝑑𝑐 u 𝑞=1 (16)𝑉 𝑏𝑙𝑜𝑐𝑘,𝑇 = 6(5 𝑢 − 1)𝑉 𝑑𝑐(17) …”

A Novel Controller Strategy for LCL Damping in Reduced DC Voltage fed D-STATCOM

“…However, they suffer from drawbacks such as increment in the number of cells for higher voltage requirement and hence, increment in DC supplies (cascaded hybrid bridge MLIs), increased system cost and losses and loss of system reliability [3], [4]. The neutral point capacitor type and flying capacitor type MLI, though unlike cascaded hybrid bridge, have single DC source, but they suffer from the drawback of voltage imbalance [5] - [7].…”