This paper presents four different sequential switching hybrid-modulation strategies and compared for cascaded multilevel inverters. Hybrid-modulation strategies represent combinations of fundamental-frequency modulation and multilevel sinusoidal-modulation (MSPWM) strategies, and are designed for performance of the well-known alternative phase opposition disposition, phase-shifted carrier, carrier-based space-vector modulation, and single-carrier sinusoidal-modulations. The main characteristic of these modulations are the reduction of switching losses with good harmonic performance, balanced power loss dissipation among the devices with in a cell, and among the series-connected cells. MSPWM and its base modulator design are implemented on a TMS320F2407 digital signal processor (DSP). Complex programmable logic device realizes hybrid-modulation algorithm with base pulsewidth modulation (PWM) circulation, and is integrated with DSP for sequential switching hybrid PWM generation. The proposed modulations can be easily extended to three phase, and higher level inverters, operates with same physical structure of the power module. The feasibility of these hybrid modulations are verified through spectral analysis, power loss analysis, simulation, and experimental results.

The rapid conversion of automotive accessory loads to the electrical domain demands a power converter to interface between the on‐board source and storage units with the accessories. This study proposes a simplified structure of dual input dual output (DIDO) with single‐stage power conversion for hybrid electric vehicle accessory applications. The topology is synthesised using pulsating source cells. The generic switch model‐based DIDO is realised with power switches based on switch realisation technique. Steady‐state and equivalent circuit models describing the converter structure are presented. Numerical simulations were performed with the state‐space averaged mathematical model. A one‐step‐ahead controller is used for inductor current control in conjunction with a mode selection logic to utilise its operating modes based on the availability of the sources and its protection. The performance of the proposed converter and its associated control scheme under steady‐state, transient conditions are corroborated by simulation and experimental results.

This study presents certain sequential switching hybrid modulation strategies, and compared for multiphase multilevel inverters. Hybrid modulation represents the combination of fundamental frequency, and multilevel sinusoidal modulations and designed for performance of the well-known alternative phase opposition disposition, phase shifted carrier, carrier-based space vector modulation and single-carrier sinusoidal modulations. The main characteristic of these modulations are the reduction of switching losses with good harmonic performance. A simple sequential switching and base pulse-width modulation (PWM) circulation techniques are embedded with these modulations, to achieve balanced power dissipation among the devices within a cell and for series connected cells, equal load sharing and balanced DC-link capacitor voltages. Multilevel sinusoidal PWM and its base modulation design are implemented on a TMS320F2407 digital signal processor (DSP). Complex programmable logic device realises hybrid control algorithm with base PWM circulation and integrated with DSP for sequential switching hybrid PWM generation. The feasibility of these modulations are theoretically analysed for five-level and then generalised for N-level, validated by simulation and confirmed practically for a five-level inverter.