Abstract
This paper presents the hybrid phase-shifted carrier (PSC) modulation for cascaded voltage source inverters, investigates their performance characteristics, and provides a comparison with the standard pulse-width modulation (PWM) methods. The proposed PWM combines the features of fundamental frequency PWM and high-frequency PSC-PWM in power conversion, and resolves the contradiction between high frequency and accuracy in a digital control scheme. The proposed PWM is developed based on PWM base generator and hybrid PWM control algorithm, and it is implemented using TMS320 F2407 DSP processor and Xilinx XC95108 CPLD controller, respectively. The main characteristic of this hybrid modulation is the reduction in switching losses, effectively improving harmonic performance, and solving the problem of unequal voltage stress and current stress of power devices. The performance of this hybrid modulation is analysed and compared with the original strategies. Power losses, total harmonic distortion (THD), weighted THD and the normalised weighted THD are evaluated. Simulation and experimental results verify that the proposed PWM technique is superior to standard techniques. Finally, it is concluded that the proposed strategy is highly suited to inverters with high number of voltage levels.
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