11-Level Operation With Voltage-Balance Control of WE-Type Inverter Using Conventional and DE-SHE Techniques

Abstract

This article presents an 11-level operation of the WE (Wee)-Type inverter. The topology employs a single DC-source, has a reduced number of components, and exhibits a boosting capability. A voltage balancing algorithm is proposed where the inverter's redundant states are employed to maintain the auxiliary DC-link voltage. It is shown that with the control algorithm, the link voltage is preserved at half the primary DC-link voltage, and the 11-level operation is possible for any load. The presented 11-level WEtype structure is also compared with recent 11-level structures and has a lowest cost factor. Two modulation strategies verify the 11-level operation of the inverter: first, a modified nearest level control (MNLC) with the usage of both zero states is developed; and, second, selective harmonic elimination (SHE) is employed, where the angles are generated using a differential evolution (DE) technique. The maximum efficiency of the inverter is 97.55 %. The performance of the inverter is validated in MATLAB/Simulink and on the hardware-in-the-loop platform.INDEX TERMS WE-Type Inverter, 11-level operation, boosted output voltage, modified nearest level control, differential evolution, selective harmonic elimination.

A 7L and 11L High Step-Up SCMLI Topology With Reduced Component Voltage Stress

“…While considering the boosting ability, the proposed topology and the one in [29] and [34] can boost the input voltage to 2.5 times. The topologies [20], [26]- [28], [29] and [35] have a boosting factor lower than the proposed topology. The MBVp.u.…”

ASO-Based SHE Method on Hybrid Multilevel Inverter for PV Application Under Dynamic Operating Conditions

“…From the comparison, it can be seen that the 11-level hybrid MLI topology used in this work and 11-level SDDS MLI [28] are symmetric and multisource topologies that do not require charge balance circuit and scheme. On the contrary, WE-type 11-level Inverter [33], UXE type 11-level inverter [34] and boost ANPC 11-level Inverter [35] are asymmetric and single source topologies which require charge balance circuit and scheme due to the presence of capacitors. In terms of quantitative comparison with 11-level SDDS MLI topology, the 11-level hybrid MLI topology excels in terms of Nsource, Nd and Ncomp.…”

11 Level boost inverter topology with dual‐source configuration

“…To demonstrate the feature discussed in the previous section, a comparative analysis is performed in this section against some of the recent topologies [4, 5, 10, 16–22]. The comparison is done on the basis of the available number of switches, number of diodes, number of capacitors, voltage gain, TSV, and PIV.…”

“…The topology presented in [16, 19] produces the same level of output but requires more and diode in comparison to the proposed topology. In case of MLIs elaborated in [21, 22], using less dc sources and requires no diode, however, to produce output voltage of 11‐level the required switches as well as capacitance are much more than the proposed MLI.…”

“…In which, the H-bridge at the backend and switched capacitor at the frontend are used to generate the output. A similar approach has been adopted in the topologies of [16][17][18][19][20][21][22], however, the device count has been the limiting factor for these topologies. In this work, a dual-source dc to ac converter topology has been presented.…”