RT journal article
T1 Staircase modulation improvement to balance output power of stages of cascade H-bridge multilevel inverter
A1 Sedaghati, Alireza
A1 Horrillo Quintero, Pablo
A1 Sánchez Sainz, Higinio
A1 Fernández Ramírez, Luis Miguel
A2 Ingeniería Eléctrica
K1 Power balancing
K1 cascade H-bridge multilevel inverter (CHB-MLI)
K1 staircase modulation (SCM)
K1 nearest level of control (NLC)
K1 utilization
K1 total harmonic distortion (THD)
AB In this study, different methods were investigated to minimize the power imbalance between the stages of a cascade H-bridge (CHB) multilevel inverter (MLI). First-in-first-out (FIFO) and first-in-last-out (FILO)are two common staircase-modulation (SCM) methods. A CHB-MLI with FIFO modulation, even withthe same conduction times, cannot distribute power equally between the stages. A new algorithm ispresented in this study to balance the power between the inverter stages. This is important to increase the lifetime of the PV sources that feed the inverter. To implement the new algorithm, all possible switching patterns based on the angles obtained from the nearest level of control (NLC) method are defined as the sample spaces of random variables. Subsequently, a random vector is defined for a set of random variables, and an optimization problem with finite and discrete solutions is applied. This algorithm is effectively used to minimize the power imbalance between the stages, even in impedance loads, from the purely inductive to the pure capacitive range. In addition, with slight changes in the switching angles, the operation of the stages and the inverter efficiency increases. Finally, the simulation and experimental results confirm the validity and practicality of the proposed modulation.
PB Elsevier
SN 0045-7906
YR 2022
FD 2022-10
LK http://hdl.handle.net/10498/34103
UL http://hdl.handle.net/10498/34103
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-may-2026